diagnostic.dll
If that doesn't work, you will have to copy diagnostic.dll to your system directory. By default, this is: Windows 95/98/Me - C:\Windows\System Windows NT/2000 - C:\WINNT\System32 Windows XP, Vista, 7, 10 - C:\Windows\System32 If you use a 64-bit version of Windows, you should also copy diagnostic.dll to C:\Windows\SysWOW64\ Make a backup copy of the original files Overwrite any existing files Reboot your computer. If the problem still occurs, try the following: Open Windows Start menu and select "Run...". Type CMD and press Enter (or if you use Windows ME, type COMMAND) Type regsvr32 diagnostic.dll and press Enter. If you can't find windows directory try the following: Open Windows Start menu and select "Run...". Type CMD and press Enter (or if you use Windows ME, type COMMAND) Type %WINDIR% and press Enter. Other versions of this file:
diagnostic: |