I used to hate my Windows ME box. Then I installed 98 and 2000. Everything was right in the world again.
I used to hate my Mac Classic because it was too slow for 7.1 Throw in 6.0.8 and all is well.
Seriously, most frustration with computers is due to a power of the computer/overhead of the os mismatch, or you have a lousy OS to begin with.
OSes to avoid: 95, any 98 other than SE, ME, and XP Home Edition.