The system had one drive with two partitions both running Windows 7. The first one, I deleted. This didn't have the MBR or bootloader on it. The second one was kept, but resized to fit the whole drive. After I did this and restarted, there were duplicate entries in the bootloader. I ran both, and they gave me the same result: The drive letter is now J (I think) instead of F. The background is plain blue with no Aero theme, so it must be referencing the old drive letter. No taskbar, so I started Task Manager with Ctrl-Alt-Del, and ran cmd. If I type regedit, it says the system can not find the file specified, even if I do dir in :\Windows, I can see the file.
I booted from the recovery disk and messed with \HKLM\SYSTEM\MountedDevices, and now it won't boot at all, but it shows the error message and asks to go to Safe Mode, Last Known Good Configuration, and Start Normally. When I select Safe Mode/Start Windows Normally it says autochk not found - skipping autocheck, and reboots.
Last Known Good Config does not work.
I read that I should just delete MountedDevices and let it rebuild this. Should I do this and try to repair it after I do that? I'm scared I will mess things up permanently. I can't do a clean install, it's for someone else's computer, and there are settings in it that I can't transfer to another drive.
EDIT: After some research, I found this article: http://winsystech.blogspot.com/2014/01/autochk-program-not-found-skipping.html
In this image ( http://imgur.com/ZnmolMi ) it shows 3 similar entries. This is because there are 3 partitions (System Reserved, Windows, and Manufacturer Recovery). Which one should I use? The middle one? Since the middle would be Windows? The ones that start with d5 49 3b ff are the ones I'm talking about.
EDIT 2: The first four bytes are the disk ID and the next eight are the partition offset. It would be the one with the middle value. I am going to try to see if I can follow the guide to recreate it.