win95, win98 were alright for me if I only ran 1 program any more than that and it would crash.

winME.. good luck it was a downgrade from win98.

Winnt was pretty good but the driver support was horrible. and I couldn't use anything USB

win2k was a god send. game compatibility was an issue tho.

winxp I have sexual thoughts about. it has made my life so much easier. I reboot once a week instead of once an hour. and I usually am running about 20 programs at a time ranging from PS, DW, FW and any other design program you can think of. It also runs as a test server so I can use my laptop for PHP development.