You could start fresh with a reinstall of Windows 7 without choosing to dual boot. (Not the easiest solution). This may be your only solution if Vista is on the C: drive.
You could try to boot off the Windows7 disc and do a "repair" on the Windows7 installation, but I'm not sure if you can do that without deleting the partition first (it may try to repair the dual boot).
If you have a spare hard drive around, you could mount it in the computer, and remove the current hard drive. Then install windows on the new drive. Then reinstall the original drive (along with the new) and format the partition from within the new windows install. When you're finished, you would then remove the new drive and reboot from the old/original. I'm not sure if there would be problems trying to boot the drive after the deletion, but if there is, you could boot of the win7 disc and do a "repair" on the original install.
If you don't have a spare HD, you could mount the existing drive in an external USB case, or connect/install it to another computer to delete the partition. Then proceed as above.
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