text: They others are right.  You can not run two anti-virus programs at the same time.  They will conflict with each other, each trying to control any files you open so they can scan them, and each thinking the other is some type of virus trying to prevent it from working.\n\nIf you feel the need to have a second virus scanner on your PC, use one of the online scanners (like Mircotrend) which does not run in the background, but only when you go online and specifically run it. About once a week check the PC with it to be sure there is nothing the Norton or the AVG, whichever you choose, is missing.