Had something similar once .. happened immediately after I played with the virtual memory settings in XP. There is a memory issue with puters above a certain memory level (early morning here, caffeine hasn't kicked in yet, brain not functioning) with a patch file available at CL. It's also possible the prog you installed and removed had a tinker with your virtual memory, but didn't put it back how it was. There are threads around here on this issue .. do a search and good luck. btw 4.03 is the latest P4 issue. But your new powerful machine prolly needs that memory patch.