I've got a W2k PRo machine that won't boot after installing Service Pack 4. Can't find ntldr. I ran the install disk and chose Repair to get it to boot. System files are in a WINDOWS folder instead of WINNT. I suspect the MBR is looking in the wrong place. I uninstalled the Serv. Pack 4, but still can't get it to boot without going through the Install/Repair process. Does anyone have any tips on how to get into the MBR? also, no ERD or backups available.