Well I have always had a difficulty correcting my grub after the linux installation has been removed, this howto tells you ways to get back your windows boot manager after your linux installation has been removed

Insert your recovery disc, in my case Windows 7, recovery.

Boot the disc and select command prompt in repair options , this option may vary , i have a HP laptop and i go into “Boot from disc ” in the first menu and then select ” Run checkup to detect problems”, and then select “Open command prompt”.

1. Run bootrec /nt60 c: /force /mbr

2. In laptops your manufacturer may provide a SYS partition where the MBR recides, in that case replace c: with SYS.

3. also try bootsect /nt60 c:/ if the former doesnt work.