Last night the computer just ground to a halt after a reset. Since then, XP is taking minutes to start up completely, not seconds. Right-clicking an icon on the desktop has become a situation where it takes 10-12 seconds before it registers and brings up the right-click menu, but is instant from then on.
Thoughts on what to do would be appreciated. I re-shuffled Service Pack 1 on here just in case last night, that's done nothing.