Your pc will be getting slower as time goes. One simply step can be taken to gain back that little performances you have lost :
Defrag your disks using DISK DEFRAGMENTER in Windows XP (under All Programs - Accesories - System Tools). The defrag process could take up to as long as 45 mins to complete.
If you do not have the luxury of time to wait, there's an alternative. Download Auslogics Disk Defrag. Click here. It will defrag your disks in no time. Try it & you will love it. What's more, it's free!!!