i'll stick with MAJOR's reply.
Win98SE was really good one (ahhh, old days),
3 weeks back, I have dual boot with WinXP PRO (for designing) and Win 2000 Pro, (for development). and 2K Pro seems like to be putting load on my system.
so eventually I have to stick another COA label of WinXP Home on my systam casing, I got rid of 2K Pro, and now XP-Pro is use for development, and XP-Home for designing. (system's running cool)
Intel Core2Quad 2.66Ghz 12MB L2-Cache
4096MB DDR Kingston Hyper-X
XFX 9600GT AlphaDog
Seagate 2 X 320GB SATA2
LG L246WH Flatron 24"