|well you should ONLY use ONE AV at a time, using 2 will cause adverse effects. Jam was right McAfee is pretty bad.|
You may want to borrow an XP install disc and do an sfc /scannow
I really don't know which version you have because you put in ??? You will need either a pro or a home CD to complete the above.
You cannot mix and match, it doesn't work.
Sounds like some files got corrupted.
Also, if you HAD Norton on before the other 2 you mentioned, you may want to go to the Norton website and use their removal tool because as long as there are remnants of Norton on your PC, no other AV will function properly.
Some HELP in posting on Computing.net plus free progs and instructions Cheers