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I'd suggest you check the output of sudo fdisk -l in Ubuntu. If you just installed win 7, you probably had some other OS on it previously and it may have a recovery partition. If win 7 is on (hd0,0), it should boot with the entry you listed for Grub unless your windows bootloader files got messed up.
Ok. I have fixed the problem. There was nothing wrong with either GRUB or Ubuntu.
I had to insert the Windows Vista disc and run a starup repair.
See, there is a master boot record. And from what I can determine, some hard disks (or operating systems) have a sort-of boot record on the partition. Obviously, in the linux community, the GRUB would be able to handle it perfectly; however, in the Windows community, there is some form of boot handler on the C: partition. The boot handler on my C: drive was corrupted. Vista seemed to have corrected it.
All of my operating systems on that computer are working as I have seen previously.
I have officially found that the Windows 7 boot handler to be the weakest out of all of the Windows operating systems.
After installing a Windows 7 system onto a dual-boot machine, I re-installed GRUB. GRUB booted Ubuntu 8.04, perfectly; however, when booting the Windows 7 installation, it would return to the boot selection screen or hang with the message, "Starting up...\nGRUB"
I, then, performed a startup repair using Windows Vista and it corrected the problem. After finding that "Upgrading" is b.s., I clean installed my Windows 7 system, and again, I have to correct the boot loader.
I will find out tonight whether the startup repair on, an official copy (hologram present), the Windows 7 install disc fairs as good as the Windows Vista install disc.