How can i solve (un)booting windows 7 on the same partition with grub?

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http://askubuntu.com – Iv been researching for 2/3 days about this problem and i have came up empty. Basically, partition 1 is windows 7 and partition 2 is ubuntu 12.04. I told ubuntu (when installing to partition 2) to install grub on partition 1, and that works fine. But the problem now is that I cant not boot windows 7, it just returns to the grub after i select it. Like I said before I researched if I can edit grub too boot windows 7 "mbr" or the bootloader "\wiondows\system32\winload.exe" (without using windows 7 repair disk). Is this even possible? (HowTos)