Thanks for the quick reply, Marcos.
Yes, that would have been helpful, sorry about that. It said: "C:\Windows\Installer\4a824.msi » MSI » Cabs.w1.cab » CAB » WINZIPSSRegClean.exe - probably a variant of Win32/Systweak potentially unwanted application - action selection postponed until scan completion." It wouldn't clean it and even after quarntining it, it said it was unable to move the file. I was reluctant to let it delete the file as after researching online, this may be a necessary file for windows to operate correctly (if this is a false positive).
So, I did another clean install and this time I didn't download any windows updates, and NOD32 says my system is clean, so Microsoft is sending me this suspect file as part of it's normal windows update. Is it possible that Microsoft is sending out an infected file/program?
Now Nod32 is telling me that my computer is at risk because there are critical windows updates that need to be installed, but I'm reluctant to let it update as I'm afraid it will infect my computer again. I tried to submit the file to you but even after compressing, it's too big for my email system, and when I right click on the file and use the ESET submission option, it says "file not submitted," again, I suspect due to the size.
Thanks again for any advice.
Steve