Hello!
Thank you for updating QuickDiag, however the problem still persists, even in Safe Mode.
Now, the error message is this: "Line 7936 (File "C:\Users\TMA\Downloads\quickdiag_2_21.06.2016.2.exe"): Error: The requested action with this object has failed."
The problem file is still the same: C:\Windows\Installer\3ef7a91.msi
I have tried running QuickDiag from Windows Explorer/Administrat...