Try reloading the OS from scratch to factory conditions and as an aside consider that XP's days are numbered. All it takes is CONDUIT to make you a believer. Link about that?
I'd consider installing a nice Linux if you can't move up.
Windows XP SP3.
I've bought an old NEC Versa laptop for a back up machine. Everything works properly except that in any window with a side scroll bar (email, IE and Chrome etc.) after using the bar to scroll up or down to the part of the page I want, I move the cursor over to the target place but as soon as the cursor comes away from the bar, the page goes crazy and whizzes up and down every time I move the cursor left or right, even slightly. It makes it impossible to get to where I want to. I've tried everything I know or can guess at with no luck. Eventually, and at random it settles down for no reason that I can find or repeat and then it's fine until I use the scroll bar again. Thanks for any help that anyone can give.