which should i use.

I have tried both. Avast found a virus that AVG didn't. Avast had a false positive for the ActiveScan program. Both seem to do a good job, but Avast you have to manually scan whereas AVG will scann at a set time everyday.

I recommend them.

Hope this helps

I have used AVG for over two years with no problems. I used the free version for a month and then bought the full version. I also run Bob's Anti-Parasite Suite regularly.

http://reviews.cnet.com/5208-6132-0.html?forumID=32&threadID=1313&start=0

It really is a matter of personal preference. Try them both and see which one you like the best. Note: you can't run them on your PC at the same time, so try one for a week, uninstall, them try the next one.

Both have been tested indepentently and have scored very well. Much better in fact, than many of their commercial ($$$) counterparts.

I've used AVG for about 4 years on XP Home and use Avast on my Windows 64 box because AVG hasn't come out with a AMD 64 bit version, as of the last time I checked.

Either of these apps, along with a firewall and anti-spyware tools, should give you good intrusion protection. As always Microsoft updates are your first line of defense.