I've been using Avira Antivir Personal...seems to work very well.

I have found Avast! Home Edition to be very lite and working well. It may not be the most complex anti-virus software.......but it fits my needs.

http://www.norton.com/win7

There goes.

Using Avast Antivirus Home Edition here for now, it would appear that my version of NOD32 is not compatible with Win7.  I know there is a newer version of NOD32 out, but I cannot afford to keep buying it every time they come out with a new version.  So far Avast is doing just as good a job for me, and it is free!

VIPRE. i used to be a devoted nod32 user until i tested VIPRE. it's inexpensive, too!

jafo, will you be changing the cpu cooler on that new machine?

I considered the new Norton products for W7, but they're only good for 14 days at a time.  

I've read comments on Vipre that claims it removed explorer.exe making their system unbootable, so I wouldn't recommend it to the less tech savvy. And in lack of professional testing of its efficiency, I don't trust it enough to consider using it myself.

Just because you or your security suite didn't detect a problem, it doesn't necessarily have to mean it's not there... Not all malware cause your computer to slow down or crash.

I use NIS 2009 (not the gamer version). It has a negligible effect on gaming. With the exception of barely noticable (we're talking about fractions of a second here, rather than actually count several seconds like other suites) longer loading times, I haven't noticed any degradation at all in performance when playing games. The footprint of the NIS 2009 engine really is more like a toeprint, barely using any memory/cpu at all running resident.

If you have doubts... Try the free trial... When you've done that, if you still feel it's a resource hog, come back and tell me how you came to that comnclusion.