Was just wondering... my PC is running increasingly badly and crashing
more often, to the extent that I reckon I need to reformat the HD and do
a clean re-install of XP, which no doubt will cure the problem.

However, as a no-risk option I thought it might first be worth trying to
'repair' the existing installation, which is one of the options on my XP
bootable CD.

How would that work, given that my XP disks are (IIRC) SP1, and I'm
currently running SP3? Does that matter or will I screw everything up
if I try?

Thanks
David