udc_inst.dll is considered a type of Dynamic Link Library (DLL) file. Dynamic Link Library files, like udc_inst.dll, are essentially a "guide book" that stores information and instructions for executable (EXE) files - like MpSigStub.exe - to follow. These files were created so that multiple programs (eg. Universal Document Converter) could share the same udc_inst.dll file, saving valuable memory allocation, therefore making your computer run more efficiently.
Unfortunately, what makes DLL files so convenient and efficient, also makes them extremely vulnerable to problems. If something happens to a shared DLL file, either it goes missing or gets corrupted in some way, it can generate a "runtime" error message. Runtime is pretty self-explanatory; it means that these errors are triggered when udc_inst.dll is attempted to be loaded either when Universal Document Converter is starting up, or in some cases already running. Some of the most common udc_inst.dll errors include:
- Access Violation at address - udc_inst.dll.
- udc_inst.dll could not be found.
- Cannot find C:\Windows\System32\spool\drivers\x64\3\udc_inst.dll.
- Cannot register udc_inst.dll.
- Cannot start Universal Document Converter. A required component is missing: udc_inst.dll. Please install Universal Document Converter again.
- Failed to load udc_inst.dll.
- The application has failed to start because udc_inst.dll was not found.
- The file udc_inst.dll is missing or corrupt.
- This application failed to start because udc_inst.dll was not found. Re-installing the application may fix this problem.
Your udc_inst.dll file could be missing due to accidental deletion, uninstalled as a shared file of another program (shared with Universal Document Converter), or deleted by a malware infection. Furthermore, udc_inst.dll file corruption could be caused from a power outage when loading Universal Document Converter, system crash while loading udc_inst.dll, bad sectors on your storage media (usually your primary hard drive), or quite commonly, a malware infection. Thus, it's critical to make sure your anti-virus is kept up-to-date and scanning regularly.