I just found out that Microsoft Fix It tool won't work on Windows 8.1. You will get this error:
We're sorry, but your operating system is not supported by Microsoft Fix it at this time.
It appears that the Microsoft Fix It has been re-branded as a Solution Center and this version works with Windows 8.1, Windows 8 & Windows 7.
1. Go here: http://support.microsoft.com/fixit/
2. Under Section 2, select: Install or upgrade software or hardware
3. Run Now: Fix problems that programs cannot be installed or uninstalled.