At the point when an application requires diagpackage.dll, Windows will check the application and framework folders for this .dll file. If the file is missing you may get an error and the application may not work appropriately.
.DLL Error Examples
This application has neglected to start because diagpackage.dll was not found. Re-installing the application may fix this issue.
diagpackage.dll Not Found.
Fixes for diagpackage.dll errors.
Re-Install the application that requires diagpackage.dll.
Update the application to the latest version.
Install all Windows updates and any available driver updates.
Clean your registry and optimize your computer.
Download and install diagpackage.dll.
Point to Remember:
Did you know? You may as of now have this file, despite the fact that you are getting .dll errors. That is because the .dll file may have been moved or renamed by another application. Verify whether you as of now have diagpackage.dll on your PC.