msiexec.exe - Bad Image (window title)
C:\Windows\AppAtch\AppPatch64\ACgGenral.DLL is either not designed to run on Windows or it contains an error. Try installing the program again using the original installation media or contact your system administrator or the software vendor for support.
I have tried a system restore but the process gets stuck (which I suspect maybe due to the dll file problem)
Please advise what is the best way to fix this, short of completely reinstalling windows 7?