I recently upgraded my system to an AMD64 3500+ (Winchester) chip and an MSI K8N Neo2 MB (with an NVidia nForce3 Ultra chipset), plus 1 gig of dual channel memory and a 120 gig Seagate ATA hard drive. I am currently running XP Pro with SP2. Unfortunately, I found that when I installed my software, my system would "hang up". After considerable work, I discovered that the problem was with NOD32. The problem doesn't occur until NOD is installed, and stops once I uninstall the program. I remain(!) devoted to NOD32, and have used it quite successfully for almost a year and a half. So I am understandably chagrined at this turn of events and hope that I will not have to use some other AV. If there is anything you can do to help me with my predicament, I would be most grateful.