The problem goes much deeper than this. I followed all the directions in the FAQ and as the last resort, uninstalled and reinstalled McAfee Virusscan. Twice.
Not only did it not stop the error from occuring, my computer would freeze if I opened any other programs. I couldn't even close them or do a restart! The only way I could get my system back was to manually turn off the computer and turn it back on.
Finally, I removed McAfee Internet completely. Guess what? Everything runs fine now. Except I have no virus protection!
I'm running Vista 32 bit, IE8 and Mozilla Firefox. Please advise