the free ones like AVAST, AVIRA etc also have paid versions they make their money from those and are wonderful in that they also offer a free version to help those who can not afford to pay, the free versions have a bit less on them than the paid versions of course. It benefits everyone when each person can have good updated programs on their pc which is why many of the companies do offer a free version. In pay versions Kaspersky is an excellent choice, it is likely the one I would choose if I used a pay version it or Nod 32. I personally use AVAST free on my windows machines and feel it is an excellent product. The main thing to remember is layered security so along with your fully updated Antivirus you also need good antimalware programs like malwarebytes and superantispyware which are also free which should be updated and run full scans once a week or so. In addition having spywareblaster is another layer that protects you while online and requires no scans just update it weekly and hit the enable all protection button so the shield is green. And of course a firewall, if you have a properly configured router you have a hardware firewall there protecting you but you should have a software one also, vista and windows 7 have a decent one built in. SpywareBlaster SUPERAntiSpyware Free I think you have malwarebytes already? you will of course have to get Trend Micro fully removed from the pc before changing to any other antivirus program. as important these days is to make sure everything is kept updated and patched using Secunia tool makes that easy Secunia Online Software Inspector (OSI)

Raven, the scan with F-Secure came up clean. Thanks, Mikie. I highlighted and deleted all the files that were from partition D. Then I highlighted the 4 files from C (all were dated May 2005)and clicked to restore. A pop up message said they were successfully restored, yet they still show up in the chest as infected files, even after a reboot. That I do not understand. I think I will send them to Alwil to be checked, since I am almost 100% sure they are not infected files. I followed the file path on each one and found them in the proper places, so I guess that means they were restored. Tomorrow I will run another scan with F-Secure, and if these files are, in fact, restored that should indicate if they are infected. I think I've tried to make a mountain from a molehill, but that's just the way I am, a stickler for details.

I would uninstall it (do not delete it) thru Add/Remove programs in Control Panel and make sure you install the free version of Avast

I agree, it's definitely not necessary to uninstall the old antivirus software before downloading a new one. But before installing the new one, for sure. fredda, at the risk of stating the obvious, Windows XP is no longer supported from a security standpoint and using it does entail some risk. So long as you are using this PC for general purposes only and not for essential uses with any Win-only software, I would seriously consider installing Linux (a different operating system that's available for no cost) to replace XP. Start a new thread on that topic if that may apply to you, there are other contributors here (not me) who can provide helpful guidance.