There is no reason to run Clean All except making data unrecoverable by most methods. Any other reason like writing zeroes to the boot sector to overwrite bad or conflicting code can be accomplished by the Clean command. Reboot the computer and run Diskpart Clean Command
Make sure you have the latest BIOS update as this is sometimes required to handle drives that large.
If you plan to install to the drive, unplug all others and use the booted installer Custom>Drive options to partition and format: Clean Install Windows 7
Otherwise partition in Disk mgmt. That may have been all you needed in the first place - to delete, Create and Format in Disk Mgmt. Partition or Volume - Create New.
The Clean commands really are only needed for troubleshooting purposes otherwise.