Win 7 boot problem

[QUOTE=boyans;1785588]

Boot Windows CD/DVD.
From System Recovery options -> Command Prompt:

bootsect /nt60 all /force /mbr
bcdboot c:\windows

Boyans' solution worked for the problem I had. I vainly deleted my system partition (D:/) which was separate from the windows installation (C:/). When Windows wouldn't start, I ran startup repair from my installation CD. The CD at first detected problems (and possibly fixed them?) but Windows still wouldn't start. From then on, I ran startup repair a couple more times and it did not detect any issues and still Windows would not boot. Then I followed the two commands, restarted, and everything has worked fine.

You must mark the target partition Active before running Startup Repair to automatically repair Win7 boot.

Partition - Mark as Active (Method Two)
Startup Repair - Run 3 Separate Times

I made a recovery USB key bootable.
I then tried the 2 suggested commands:
1) bootsect /nt60 all /force /mbr
it succeeded (successfully updated FAT 32 filesystem bootcode and successfully updated disk bootcode)
2) bcdboot c:\windows
"échec lors de la tentative de copie de fichiers de démarrage" in french, so the message in english should be something like "fail in copying boot files"

Then, I was not able to boot with the USB key anymore !
There was a "Windows Boot Manager" screen, showing "Windows failed to start" ... "\Boot\BCD" ... "status 0xc000000f"
Thank you for your help, I would really appreciate not to reinstall Win 7 if possible.

P.S. I am running Win 7 32 bits

I got a Win 7 DVD here at work so I will try it at home later this weekend.
I will also check with UCB the C: drive because I have a doubt now, it could be a Win 7 64 bits (I don't use this computer very often).
The COA sticker is not really helping as this computer was originally installed with Windows Vista.
Thanks again for your help.

Then how are you activating Win7?

2) bcdboot c:\windows
"échec lors de la tentative de copie de fichiers de démarrage" in french, so the message in english should be something like "fail in copying boot files"

The command can fail for several reasons:
1. The files in \boot directory and bootmgr are newer than the source (protected Windows 7 system files).
2. Wrong source specified. (source root should be \Windows directory of installed system !)

Solution: on command line in recovery, root of system drive is selected by drive_letter e.g "c:" or "d:" or.....(=drive_letter of active partition)

attrib -r -s -h bootmgr
del bootmgr
attrib -s -h \boot\BCD
del \boot\BCD

Commands delete bootmgr and BCD store (this will permanently delete any dual or multi boot settings in BCD !).
Later bcdboot command will recreate bootmgr and BCD (assuming Windows system file sources are intact).

It is important that the Windows 7 version installed and the
Recovery CD/DVD used have the same bit size 32-bit or 64-bit !!

After a major update of Windows 7 e.g. SP1 it is good to create a new version of Recovery CD/DVD:
in Windows 7 -> Start -> Run -> type "Create System Repair Disk" and run,
a form pops up with destionation DVD/CD drive, insert blank disk and burn.

To Boyans:
I think the problem is that I have no access to "C:" drive.
In recovery mode, the command prompt is showing "X:"

To gregrocker:

Are you working for Microsoft ? ;-)
The key is written on the CD but I still didn't find it.