BOOTMGR is missing after Windows Server restart

After restarting a Windows Server I got this error message:

The following solution from the Binary War blog worked for me:

1. Boot from Windows Server CD/DVD.
2. Click Repair your computer
3. Choose Command Prompt.
4. Run x:\sources\recovery\StartRep.exe
5. At the end of the repair process, the Wizard will ask to restart the machine (which will now hopefully boot normally).

Good luck!