I am using XP.
When I try to fix the problem by running sfs /scannow, I get the message:
"Files that are required for windows to run properly must be copied to the DLL cache...insert you windows XP professional service pack 3 cd now"
My machine came with XP preinstalled on D: drive. I did make the HP Recovery Disc when I got the machine, but these disc don't work for this and I can't seem to redirect the scan to look on the "D" drive assuming that is the correct thing to do.
I have run windows one care and it says I have 150 errors it can't fix. Before these problems started, it never reported more than one error it couldn't fix.