I had the same problem bro, all you need it's your Windows Installation CD, you boot from it, than when it shows the part where you have to choose your keyboard and language, you type on your keyboard Shift+F10 and Command Prompt will be opened. If this doesn't work, you can run the installer and go to a point where it shows somewhere Repair your computer, than you can choose Command Prompt.
In command prompt run this command:
BootRec.exe /fixmbr .
Though this may work, for me it did not work, so i used this other command:
BootRec.exe /RebuildBcd (but this will work only if you delete grub entirely. You can do that with Superboot manager in Linux, be careful with this, if you fail to repair Windows MBR (Windows Master Boot Record) you're going to have to re install Windows.
These are also two other commands you can use with BootRec.exe /FixBoot and /ScanOs
This worked for me in Windows 7 & 8. I hope I helped.
Last edited by 212; 05-19-2012 at 12:19 AM.