Posted 10 October 2012 - 11:48 PM
Hey there we can fix up your problem without using the installation media. Do not boot your computer using the Windows 7 disk, just take it out and keep it aside. Restart your computer in Safe Mode and select Repair your Computer.
1) To start your Vista PC in Safe Mode, press and hold the F8 key as your computer restarts.
2) Select a Keyboard layout and click Next
3) If prompted, enter your username and password, click OK
4) Now click Startup Repair and follow the on-screen prompts
5) Your computer may reboot several times during the procedure, which is normal so don't worry
6) If this fixes your problem, you can start your computer normally
***If you don't see Repair your Computer option when you start your computer in Safe Mode, try the next method
1) Restart your Vista computer in Safe Mode again and open Command Prompt
2) In Command Prompt window, type ‘bootrec.exe’ (without quotes) and hit the Enter key.
3) Type ‘bcdedit /export C:\BCD_Backup’ and hit the Enter key.
4) Type ‘C:’ and hit the Enter key. This will take you in the C: drive.
5) Type ‘cd boot’ and hit Enter. Type ‘attrib bcd –s –h –r’ and hit the Enter key.
6) Type ‘ren c:\boot\bcd bcd.old’ and hit the Enter key.
7) Type ‘bootrec /RebuildBcd’ and hit Enter. This will rebuild the Boot Configuration Data (BCD) store and fix the boot manager missing error.
8) Exit the Command Prompt window and restart your computer.
P.S. Your computer will reboot several times during this procedure
P.S. please let me know if it fixes your problem or not..