XP Update

Due to a major problem with my computer I have had to re-install my XP but
aren't able to get XP 2. When I hit the button to look for updates a new
window opens and the little green bar leeps shooting left to right with the
info that updates are being looked for. This has taken 4 (yes four) hours up
til now and still nothing. Any (simple and easy to understand) instructions
or suggestions will be most welcome.
.