If you just want to change the system cache in xp, it can be done through regedit. But I not too sure if it can solve your problem. Do it at your own risk

Hkey_local_machine\SYSTEM\CurrentControlSet \Control\Session Manager\Memory Management
ClearPageFileAtShutdown...change from 0 to 1
LargeSystemcache...change from 0 to 1

Next navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Contro l\FileSystem. Here were are going to edit 1 option and add 1 option.

1st Edit NtfsDisable8dot3nameCreation from 0 to 1

2nd Right click away from any REG_WORD values and choose New pick DWORD Value and change its name to NtfsMemoryUsage hit Enter

Now right click on this DWORD and Modfiy...change 0 to 2