Dell Optiplex 745 Ultra Small Form Factor.
The PC has no CD/DVD Drive.
Somehow, the boot segment got screwed up.
I had copied all the data off to another PC using a USB adapter while working on a hardware problem. (HD fan replacement)
Copied all the data back to the drive and booted.
First problem was "Bootmgr missing".
Attached an external CD/DVD drive and fixed using a Windows Pro CD, (not the original).
Now booted to "ntldr missing". Fixed that.
Now getting "hal.dll missing or corrupt"
Booting again to the RC, and using "expand d:\i386\hal.dl_ c:\windows\system32"
it comes back "Access is denied" Fixed the first 2 problems using the same Windows CD.
This is a company machine and used at a work station.
How can I get by the "Access denied"