Runs smooth on my system : P5 + SR1 patch ( still some bugs, but it's now a great software ! ) MSI KT3 Ultra ARU ( very stable ) AMD Athlon XP 1800+ @ 2000+ 512 DDR-SDRAM PC2100 Leadtek Ti 4200 @ 4400 64Mo IBM 80Go 7200 RPM - ATA 100 SeaGate 40 Go 5200 - Ata 66 Win2K + SP2 Some USB devices ( DSL modem, scanner, tablet, ... ) When I look at the differences between P5 before and after patch, I think it's mainly dealing with code issues, even if there also may have some specific conflicts - misconfigurations... I wasn't able to do anything before, now it's a real program, working great. The minor bugs will be fixed with SR2 I think.