Think I had a virus or trojan

Train: Great info on the tech support forum. I wouldn't say the commercial AV's are crap, but the free ones available now are certainly well supported, and I believe just as good. Since I work in a corporate environment, the EULA precludes me from using such products (all my PC's are work issue), therefore I'm not well versed in what's available, but have heard good things.

For ANYONE who is chronically prone to viruses: Run your PC in a limited state for the user account that is getting the virus. You should be doing this ANYWAY, since we don't want our kids accidentally deleting our tax returns, etc. Even using separate user accounts, if they are admin level, you have access to every file on the PC. Not very secure. But the big thing here is that in a limited account, nothing can be installed that alters system files without the password of an administrator account. Basically this makes your machine VERY virus proof, even without a third party AV. Windows UAC that is present in Vista and 7 is kind of an example of this. It asks permission for tasks that alter system state. Of course this is useless if the user simply accepts without thinking. Changing the user account type varies by OS, so again, Google is your friend.