Have you run SFC Scannow yet? You might give that a try. You'll need your XP CD.
You might want to see if the pagefile entry is listed within the registry as well. (Remember to be careful in the registry!)
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Contro l\Session Manager\Memory Management
For more information on the pagefile and its settings please see this URL.
Pagefile Optimization