Bootmanager is missing

Solution 1:

Boot to a dos prompt and from the Win7 DVD, in the boot folder, try running

bootsect /nt60 c:

Then run 'diskpart' and type type following

list disk
select disk 0  // Where disk 0 is where your C is
list partition
select partition 1 //Where partition 1 is C
active
exit

Reboot your system

EDIT: By DOS prompt I mean off the win7 DVD to a console, whatever they have

Solution 2:

If Bootrec cannot locate any missing Windows installations, you must remove the BCD store, and then you must re-create it. To do this, boot to command prompt and type the following commands in the order shown below. Remember to press ENTER after each command.

bcdedit /export C:\BCD_Backup  
c:
cd boot
attrib bcd -s -h -r
ren c:\boot\bcd bcd.old  
bootrec /rebuildbcd

Finally, restart the computer.