my laptop windows vista will not load info says failed to load because a critical system driver is missing or corrupt - status oxc000221 file \windows\ system32\drivers\acpi.sys.i have a recovery disc,driver cd disc, and a application & support disc but the pc does nothing when these are inserted it seems to be in a loop when i follow instuctions like selecting f8 and using tab menu i told man in shop the above he said bring it in it will be �25 to look at it but in all probabilities he said he could rebuild it for �90. any help please money is short at the moment , thanks in advance