How to Delete a Partition in Windows 7:
Logging in Windows 7 as an Administrator --> Right click on the Computer icon on the Desktop --> Select Manage option --> In the left pane of the Computer Management window, click to expand:
Computer Management (Local)\Storage\Disk Management folder
Right click on the Partition or Volume Which need to delete --> select "Delete Volume" option --> Click Yes to delete the Partition to confirm.
Then the Partition will now be deleted --> Restart your computer.