Bonnie,

I only noticed this thread now. I use Win7, and I've used a couple of different antivirus. I used AVG happily for many years, but it started acting up, primarily slowing the time things took to load. I did a survey of free programs and read reviews at cnet and decided to use Avast. I liked it, but when I switched from XP-Pro to Win7 Ultimate, I found Avast slowed things again.

I now use the enterprise version of the Microsoft Forefront antivirus that they provide through my workplace. I don't think there is a free version of this one. It seems like any antivirus slows things a bit, but when you consider the alternative, a little slower is better than dead. Cnet should provide reviews of fee as well a free software.

Good luck!

SRS