my nan had a computer for 8 years (was win 98) with no big problems and that was a dell, few little ones like slowing down and freezing after about 7 years.....
we had a computer for 6/7 years (win 95) with no problems at all, this was a custom made one we got rid of it because nothing was compatible with it, it was all going to win 98+
i have had my dell for bout 2/3 years (win xp) with countless problems (usualy aol/aol related) and quite a few blue screens, ive trippled my memory from 256mb to 768mb, added a new dvd-rw and an extra hard drive (which broke a few months ago)
it seems the newer computers are less reliable... mine has been ok the last month or 2 (touch wood)
just windows live messenger BETA never signs in, and when it does it says this program has encountered a problem and needs to close!! sometimes i am lucky and get on but hardly ever... ive gone back to 7.5, im gunna try again in a few weeks
Mike