Thanks, mike!
Okay. Maybe we can try a slightly different approach to getting the System Restore turned off on the Mac drive.
*Warning in advance: this procedure will delete all existing System Restore points.*
Head back into System Restore (right-click "My Computer", select "Properties", click the "System Restore" tab). Check *Turn off System Restore on all drives,* and click OK. Restart XP.
After XP has been restarted, head back into the System Restore tab, and try *switching on* System Restore for the Windows drive.
Does that get System Restore enabled just on the Windows drive?