Microsoft Windows SYS KEY01.SYS

How to Download KEY01.SYS and Fix Error Messages

Last Updated: 11/27/2023
[Average Article Time to Read: 4.7 minutes]

SYS files such as KEY01.SYS are categorized as Win16 EXE (Windows System Configuration) files. As a Windows System Configuration file, it was created for use in Windows 10 by Microsoft.

The first version of KEY01.SYS for Windows XP was introduced on 10/25/2001 in Windows XP. The newest file release date for Windows 10 was 07/29/2015 [version 10]. KEY01.SYS is included with Windows 10, Windows 8.1, and Windows 8.

Below, you find comprehensive file information, instructions for simple SYS file troubleshooting, and list of free KEY01.SYS downloads for each available file version.

File Analysis Provided by Jason Geater (Author)

File Overview

General Information ^✻
File Name:	KEY01.SYS
File Extension:	SYS file extension
File Type:	Driver
Description:	Windows System Configuration
MIME Type:	application/octet-stream
User Popularity Rating:

Developer and Software Information
Software Program:	Windows 10
Developer:	Microsoft
Software:	Windows
Software Version:	10

File Details
File Size (Bytes):	8960
Oldest File Date:	04/14/2008
Latest File Date:	03/18/2017

View Other KEY01.SYS Information

File Info	Description
File Size:	8.8 kB
File Modification Date/Time:	2013:08:22 01:42:34+00:00
File Inode Change Date/Time:	2017:11:05 07:04:28+00:00
File Type:	Win16 EXE
MIME Type:	application/octet-stream

^✻ Portions of file data provided by Exiftool (Phil Harvey) distributed under the Perl Artistic License.

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What are KEY01.SYS Error Messages?

KEY01.SYS Blue Screen of Death (BSOD) Errors

There are a number of reasons why you could be encountering issues with KEY01.SYS. Most of the issues concerning sys files involve Blue Screen of Death (BSOD) errors. These types of KEY01.SYS errors can be cause by hardware problems, outdated firmware, corrupt drivers, or other software-related (eg. Windows update) issues. Some of these errors include:

KEY01.SYS could not be found.
KEY01.SYS failed to load.
The file KEY01.SYS is missing or corrupt.
Windows failed to start - KEY01.SYS.

A problem has been detected and Windows has been shut down to prevent damage to your computer. The problem seems to be caused by the following file: KEY01.SYS.

:( Your PC ran into a problem that it couldn't handle, and now needs to restart. You can search for the error online: [BSOD] (KEY01.SYS).

STOP 0x0000000A: IRQL NOT LESS EQUAL (KEY01.SYS) STOP 0x00000050: PAGE FAULT IN A NONPAGED AREA (KEY01.SYS) STOP 0x0000007E: SYSTEM THREAD EXCEPTION NOT HANDLED (KEY01.SYS) STOP 0x0000003B: SYSTEM SERVICE EXCEPTION (KEY01.SYS) STOP 0×0000007A: KERNEL DATA INPAGE (KEY01.SYS) STOP 0x0000001E: KMODE EXCEPTION NOT HANDLED (KEY01.SYS)

It's Critical to Resolve Blue Screen of Death Errors

In the majority of cases, you will encounter KEY01.SYS BSOD errors after you've installed new hardware, software (Windows), or performed a failed Windows Update. In other cases, software corruption caused by a malware infection can lead to KEY01.SYS Blue Screen of Death errors. Therefore, it's critical to make sure your anti-virus is kept up-to-date and scanning regularly.

GEEK TIP : As a rule of thumb, it's always a good idea to create a Windows "Snapshot" backup / System Restore Point before making any hardware or software changes to your computer. That way, it's very easy to restore your system in the unfortunate event you encounter a KEY01.SYS Blue Screen of Death error after recent changes.

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How to Fix KEY01.SYS Errors in 3 Steps (Time to complete: ~5-15 minutes)

If you're encountering one of the error messages above, follow these troubleshooting steps to resolve your KEY01.SYS issue. These troubleshooting steps are listed in the recommended order of execution.

Step 1: Restore your PC back to the latest restore point, "snapshot", or backup image before error occurred.

To begin System Restore (Windows XP, Vista, 7, 8, and 10):

Hit the Windows Start button
When you see the search box, type "System Restore" and press "ENTER".
In the search results, find and click System Restore.
Please enter the administrator password (if applicable / prompted).
Follow the steps in the System Restore Wizard to choose a relevant restore point.
Restore your computer to that backup image.

If the Step 1 fails to resolve the KEY01.SYS error, please proceed to the Step 2 below.

Step 2: Run SFC (System File Checker) to restore the corrupt or missing KEY01.SYS file.

System File Checker is a utility included with every Windows version that allows you scan and restore corrupted system files. Use the SFC tool to fix missing or corrupt KEY01.SYS files (Windows XP, Vista, 7, 8, and 10):

Hit the Windows Start button
In the search box, type "cmd" but DO NOT PRESS "ENTER".
Press and hold "CTRL-Shift" on your keyboard while pressing "ENTER".
You'll be prompted with a permission dialog box.
In the box, click "YES".
You should have a black screen with a blinking cursor.
In that black screen, type "sfc /scannow" and hit "ENTER".
SFC will begin scanning for KEY01.SYS issues and any other system file problems.
Follow any on-screen commands to complete the process.

Please be aware that this scan might take a while, so please be patient while it is working.

If this Step 2 fails as well, please proceed to the Step 3 below.

sfc /scannow

Step 3: Perform a Windows Update.

When the first two steps haven't solved your issue, it might be a good idea to run Windows Update. Many KEY01.SYS error messages that are encountered can be contributed to an outdated Windows Operating System. To run Windows Update, please follow these easy steps:

Hit the Windows Start button
In the search box, type "Update" and press "ENTER".
In the Windows Update dialog box, click "Check for Updates" (or similar button depending on your Windows version)
If updates are available for download, click "Install Updates".
After the update is completed, restart your PC.

If Windows Update failed to resolve the KEY01.SYS error message, please proceed to next step. Please note that this final step is recommended for advanced PC users only.

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If Those Steps Fail: Download and Replace Your KEY01.SYS File (Caution: Advanced)

If none of the previous three troubleshooting steps have resolved your issue, you can try a more aggressive approach (Note: Not recommended for amateur PC users) by downloading and replacing your appropriate KEY01.SYS file version. We maintain a comprehensive database of 100% malware-free KEY01.SYS files for every applicable version of Windows. Please follow the steps below to download and properly replace you file:

Locate your Windows operating system version in the list of below "Download KEY01.SYS Files".
Click the appropriate "Download Now" button and download your Windows file version.
Copy the file into the appropriate directory for your Windows version:

Windows XP: C:\WINDOWS\system32\dllcache\
Windows XP: C:\Windows\System32\
Windows 8: C:\Windows\System32\
Windows 8.1: C:\Windows\System32\
Windows 10: C:\Windows\System32\

Restart your computer.

If this final step has failed and you're still encountering the error, you're only remaining option is to do a clean installation of Windows 10.

GEEK TIP : We must emphasize that reinstalling Windows will be a very time-consuming and advanced task to resolve KEY01.SYS problems. To avoid data loss, you must be sure that you have backed-up all of your important documents, pictures, software installers, and other personal data before beginning the process. If you are not currently backing up your data, you need to do so immediately.

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Download KEY01.SYS Files (Malware-Tested 100% Clean)

CAUTION : We strongly advise against downloading and copying KEY01.SYS to your appropriate Windows system directory. Microsoft typically does not release Windows SYS files for download because they are bundled together inside of a software installer. The installer's task is to ensure that all correct verifications have been made before installing and placing KEY01.SYS and all other SYS files for Windows. An incorrectly installed SYS file may create system instability and could cause your program or operating system to stop functioning altogether. Proceed with caution.

Windows 10

File Name

Software Version

File Version

Architecture

KEY01.SYS

64-bit (x64)

Expand for Detailed File Information +

OS Version:	Windows 10
File Size:	8960
File Date:	08/22/2013
MD5 Checksum:	9a355b75137e8a5f3c384c999cc6dbbc
SHA1 Checksum:	2be21636f3c2899f1217c289351b106118a5e197
SHA256 Checksum:	126a00e34a6516c0d382a221071ab4084031c2a89ccb6144cab960ce1f86ee2c
CRC32:
File Directory Location:	C:\Windows\System32\

File Version, System, and Machine Information
File Type:	Win16 EXE
File Modification Date/Time:	08/22/2013

Windows XP

File Name

Software Version

File Version

Architecture

KEY01.SYS

32-bit (x32)

Expand for Detailed File Information +

OS Version:	Windows XP
File Size:	42809
File Date:	04/14/2008
MD5 Checksum:	582bcdd47cf4b68b5cb528f18e3cb808
SHA1 Checksum:	a797501235696510d05a2d6cfee9a0a2816d5c57
SHA256 Checksum:	1bb8e25fea43943ee9bc3f79bd3cea7dcb30480ea34e95e14a4e5ec07aebaca6
CRC32:
File Directory Location:	C:\WINDOWS\system32\dllcache\ C:\Windows\System32\

File Version, System, and Machine Information
File Modification Date/Time:	04/14/2008

Windows 8.1

File Name

Software Version

File Version

Architecture

KEY01.SYS

64-bit (x64)

Expand for Detailed File Information +

OS Version:	Windows 8.1
File Size:	8960
File Date:	08/22/2013
MD5 Checksum:	9a355b75137e8a5f3c384c999cc6dbbc
SHA1 Checksum:	2be21636f3c2899f1217c289351b106118a5e197
SHA256 Checksum:	126a00e34a6516c0d382a221071ab4084031c2a89ccb6144cab960ce1f86ee2c
CRC32:
File Directory Location:	C:\Windows\System32\

File Version, System, and Machine Information
File Type:	Win16 EXE
File Modification Date/Time:	08/22/2013

Windows 8

File Name

Software Version

File Version

Architecture

KEY01.SYS

64-bit (x64)

Expand for Detailed File Information +

OS Version:	Windows 8
File Size:	42809
File Date:	07/25/2012
MD5 Checksum:	492090267b9608c62b956cd29be3afb7
SHA1 Checksum:	53f3215b6ef84ff192c45121c4223e84851321eb
SHA256 Checksum:	49ebbeee6286bd770c8b5af4e4591e4139f0ba9ef31b48daa43b696c64f0d176
CRC32:
File Directory Location:	C:\Windows\System32\

File Version, System, and Machine Information
File Modification Date/Time:	07/25/2012

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Files Related to KEY01.SYS

SYS Files Related to KEY01.SYS

File Name	Description	Software Program (Version)	File Size (bytes)	File Location
i8042prt.sys	i8042 Port Driver	Microsoft® Windows® Operating System (6.0.6000.16386)	64512	C:\Windows\Temp\
ANSI.SYS	Windows System Configuration	Windows 8	9029	C:\Windows\System32\
1394bus.sys	1394 Bus Device Driver	Microsoft® Windows® Operating System (6.1.7600.16385)	68096	C:\Windows\Panther\NewOs\Panther\
amdk8.sys	Processor Device Driver	Microsoft® Windows® Operating System (6.1.7600.16385)	64512	C:\Windows\Fonts\
null.sys	NULL Driver	Microsoft® Windows® Operating System (5.1.2600.0)	2944	C:\Windows\Panther\UnattendGC\

Other Files Related to KEY01.SYS

File Name	Description	Software Program (Version)	File Size (bytes)	File Location
OneX_v1.xsd	XML Schema Definition	Windows 8.1	5957	C:\Windows\L2Schemas\
WWAN_profile_v1.xsd	XML Schema Definition	Windows 10	6201	C:\Windows\L2Schemas\
WWAN_profile_v1.xsd	XML Schema Definition	Microsoft Office Access 2010 14	6201	C:\Windows\Temp\527D94AF-D053-4381-B105-0D815D5...
WLANAP_profile_v1.xsd	XML Schema Definition	Windows 8	7504	C:\Windows\L2Schemas\
WLANAP_profile_v1.xsd	XML Schema Definition	Windows 8.1	7548	C:\Windows\L2Schemas\

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