d3d9cap.dll is considered a type of Dynamic Link Library (DLL) file. Dynamic Link Library files, like d3d9cap.dll, are essentially a "guide book" that stores information and instructions for executable (EXE) files - like OneDriveSetup.exe - to follow. These files were created so that multiple programs (eg. Total Video Converter) could share the same d3d9cap.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 d3d9cap.dll is attempted to be loaded either when Total Video Converter is starting up, or in some cases already running. Some of the most common d3d9cap.dll errors include:
- Access Violation at address - d3d9cap.dll.
- d3d9cap.dll could not be found.
- Cannot find C:\Program Files (x86)\Total Video Converter\Plug-ins\d3d9cap.dll.
- Cannot register d3d9cap.dll.
- Cannot start Total Video Converter. A required component is missing: d3d9cap.dll. Please install Total Video Converter again.
- Failed to load d3d9cap.dll.
- The application has failed to start because d3d9cap.dll was not found.
- The file d3d9cap.dll is missing or corrupt.
- This application failed to start because d3d9cap.dll was not found. Re-installing the application may fix this problem.
Your d3d9cap.dll file could be missing due to accidental deletion, uninstalled as a shared file of another program (shared with Total Video Converter), or deleted by a malware infection. Furthermore, d3d9cap.dll file corruption could be caused from a power outage when loading Total Video Converter, system crash while loading d3d9cap.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.