XP SP1 since 2002, no reinstall, no backup used,
I somehow even managed to swap out the mainboard and CPU without having to reinstall.
Getting close to having to though, the only programs still running somewhat stably,
are PSP X, X1 & X2, eMule, mIRC, Dreamweaver 4 (8 used to work, but unfortunately no longer starts),
ThumbsPlus, and a couple of minor programs.
I can't even get a defragger to run dammit... 