when i try to update the customers computer sp2 has the system restart and scans the files and it gives me a black screen from hell, and the propsys.dll files is the issue so far. I tried the repair to no avail, i cannot copy a fresh dll into the system32 folder (from vista) have not tried safe mode to copy the dll yet. And the sfc /scannow says it cant fix the corrupted dll. and help please. BTW the system had a virus on it that was removed.