I beg to differ, 98se was slow as hell, well not at first, but after two months, preformance drops significantly. I hate reformating, it is just a pain.
Win XP pro on my laptop idles using 170MB of RAM. That is with everything running in the background (norton anti-virus, novell, wireless crap, palm software, ect). WIthout anything running I can get Win XP down to 100MB of RAM, but I wouldn't want to run my computer like that.
Do I care? No, not really.
When I am working on a troublesome computer, I like to apply percussive matinence. This is also know as "knocking the computer into its place". It may not help the problem, but it sure makes you feel better, especialy when accompanied by a shout of "Know your role!"