Hello. I'm having a problem that I can't figure out why it's happening or how to fix it.I have licenses for several AVs. KAV 5, NOD32, TrendMicro 2006, NAV 2006, and McAfee VS 10, which is free from Comcast. I can't install any of them, except for NOD32 and McAfee. When I try to install KAV 5, TM 2006 or NAV 2006, I get a cannot install due to corrupt or missing file. Maybe not exact words, but close. I tried installing from my backup CD, with no luck. I even downloaded the files from the KAV and TM sites, but that didn't work either. I have never run more than one AV on my computer at a time.I have run RegSeeker, RegCleaner, thinking that maybe there was something in the registry that was causing this problem. I also ran TuneUp Utilities. Nothing has helped.Can anyone explain what might be causing this to happen?