Reboot Windows XP two times, each time wait one full minute after the desktop appears to allow Windows time to fully write to the NTOSBOOT-B00DFAAD.PF file before proceeding, then go to "Start", "Run", Type Rundll32.exe advapi32.dll,ProcessIdleTasks. This can take 10-15 minutes to run but no notification will be given when it is finished. You will notice increased Harddrive activity while it is running wait until this stops. When this is finished in the "Run" box Type defrag c: -b and wait until the command prompt window disappears. It is not necessary to do again unless something has been added or removed from the boot sequence (Drivers, Startup Applications ect...) and you do not feel like waiting 3 days for it to be automatically optimized by Windows.