I would run a scandisk and then a defrag to eliminate any disk problems. If all else fails, use your ghost/imaging cd (whatever company you use) and reload the pc. It’s usually faster than wasting time trying a bunch of things to try and fix the problem.
The slow response of your Windows 2000 computer might be caused by a malicious software infections running into your computer system. It might also be caused by a full hard disk drive because of many installed unwanted software applications. Scan your workstation and remove unwanted installed software applications.