I am a rusty when it comes to Windows XP, But I remember fixing this problem along time ago with Disk Cleanup by clearing the thumbnail cache. To get to Disk Cleanup, Click Start and find or search "Run". Once you see a box enter, “cleanmgr” without quotes and press enter. Once you're there select the system drive letter from the drop-down, then uncheck all the entries, except Thumbnail. Afterwards Click OK, and click Delete Files to confirm.
(Edit: Not to be rude, but please next time post this in the Window XP board.)