Good grief! The same thing happened to me last night (7/8/09) at approx. 7 ET. When my wife and I returned home we found our CA Security program (free through our cable company) had run a scan on our laptop which is connectedly wirelessly to the web through a secure router connected to a desktop PC. I came home to small CA window saying some files had been quarantined and some (maybe 6 files including reg.exe - that's one I actually wrote down) were infected. While I'm not an expert computer user, I'm not a complete novice.. But this one really had me vexed. As far I could tell there was nothing to do except close the window and run another scan. In the meantime, I received a "Windows File Protection" popup telling me some original files might be corrupt, etc. The popup told me to insert Windows Pro Service Pack 3 Installation CD-Rom. My system is a Dell, so I don't even have that disc. Besides, I'm running Media Center Home Edition, not Windows Professional. I clicked CANCEL, but it popped back up. I clicked CANCEL again, and the turned my laptop off (after checking that the second scan showed no infected files and after successfully running Spybot Search & Destry). I then checked my desktop PC for trouble and found no similar problems (even after running a virus-scan). As for the laptop I haven't been able to power it back up b/c I'm now at work. I can only wonder what awaits me when I get home. Why the heck is an anti-virus program giving everyone so much grief and does any have more advice?