GRUB doesn't see Windows 7 after installing Ubuntu 12.04

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http://askubuntu.com – So, this is my first time installing Ubuntu on my hard drive, and I'm running into some problems. Until a couple of hours ago, I had 4 partitions in my hard drive: XP, Vista and 7 installations, plus a data partition. I backep up the XP and Vista partitions which weren't of any use lately, and booted a Live-USB with Ubuntu 12.04. On the "Install 12.04 LTS" partition manager thingy I deleted the XP and Vista partitions (which where sda1 and sda2 on the partition table), leaving around 260GB of free space. There, I made 3 partitions: 8GB for root, 4GB for swap, and 80GB for home. (I know, (HowTos)