sounds like you got it all under control
only thing I'd add is make sure you have all the drivers downloaded and available BEFORE you start.
install chipset
video
sound
any others
and this might be a sticking point.
some sellers "bond" their machines to a certain OS
(PC World, dixons comet) generally "own brand".
prices are kept down by reducing support to an absolute minimum
Part of that is that only the drivers for windows X will be available. Microsoft sell cheaply too ... because the only upgrade is to buy another machine.
Assuming you have the original restore disc .... you have nothing to loose - give it a go
(A friend's son offered to upgrade a girl's dixon's 98 special to XP ..... he's still trying)



