Method 1:
To repair your boot records, you have to launch the start-up option “repair your computer”.
1. Step
On boot-up press F8 to get to startup options. Click on “Repair your computer”:
2. Step
You’ll get a list of operating systems installed on your PC:
We have outlined the steps that are necessary to repair the boot manager:
Method 2:
Repair bootmgr via Command Prompt (cmd)
If Windows keeps loading X:/Windows/System32 – try to change to the C or D drive, simply enter C: and hit Enter. If that doesn’t work, enter chkdsk c: /f /r which will repair your C partition. You can then run the commands below
Open the command prompt.
Next, simply enter the following command to fix your boot record:
/fixboot
In case your master boot record has been damaged as well, I would also ru
/fixmbr
Method 3:
Repair bootmgr via “Startup Repair”
Theoretically, Windows 7 should be able to find and fix this error. If you click on “Startup Repair” instead of Command Prompt, then Windows will scan your system for common errors and will hopefully figure out that your bootmgr is broken.
Open the command prompt.
Method 3:
Check disk for errors
Another error why you are receiving the “bootmgr is missing” error after installing Windows 7, might be that your hard drive has disk errors. It is always a good idea to also run the command
chkdsk C:\ /f /r
This might take some time, depending on the size of your hard drive, but it is necessary to verify that there are no corrupted files on your disk.
