Windows ME couldnt survive 2 hours of constant use, Windows 98 lasted almost up to 24 hours before it died. Or at least that's how I experienced it
The Windows Vista comments people make seem a little stupid to me, I have people I know who act like they know computers yet criticise vista and make out XP is the best thing since sliced bread. They must have selective memory because I remember all the same when XP was released... Sadly looks like Vista is going to get short lived with the release of Windows 7 which means I doubt Vista will ever get time to recover its negative image from those people.. Though just remember Windows 7 is just Vista with some tweaks and new features.