http://www.aumha.org/win5/a/wpa.php#formatYou might want to do what this page says, just in case, so you don't lose your Windows license.
To delete the Vista partition, just use Disk Management. Control Panel>Administrative Tools>Disk Management. Right-click the Vista partition and delete it, and then right-click the 7 partition, hit Extend, and tell it to use the maximum amount available, so 7 now has the entire hard drive. If the order of partitions was 7, Vista, then this will work. If it was Vista, 7, then you'll need to run Command Prompt and run these commands: diskpart, list volume (figure out which one is the 7 partition, based on size), select volume X (replace X with the 7 partition's number from the previous command), extend.
Assuming you want to use the entire hard drive for 7.
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