hello, 2days ago i start my computer up and "cpu 1 failed' message came up on the screen from core duo (msi mb) . i then looked at device mgr, my cpu driver had changed to acpi multiprocessor pc instead of dual 5000. i tried roll back driver and reinstalling drivers but it did not change. i reinstalled win xp & tried to reinstall the correct drivers but to no avail. my system is: 5000X2 be ,msi kn9 sli v.2 , 2.0 gb gskill ddr2 ,misc psu, ati 4850 . any ideas will be welcome. ps, iv'e been using this system for over a year.