Remove GRUB/GRUB2/BURG and restore WINDOWS MBR

What you should have first is the win7 recovery disc and have it inside a CD/DVD or flash drive(use YUMI)
after booting the disc, go to the command prompt and type the following:

This part makes sure that "access denied" won't show up when restoring mbr.

Diskpart

list vol
exit

 
This part is the actual input to restore mbr. Again, "D" changes depending on your WINDOWS installation
bcdboot D:\windows /s D:
bootsect /nt60 D: /mbr
 
OR trie
 
bootsect /nt60 all
bootrec /fixmbr

 

Then you're done!

Powered