windows - I accidentally made my new hard drive (the non system drive) my primary partition

When installing a new hard drive, I accidentally formatted it using 'Disk Management' and set it up as my primary active partition, even though it isn't the system drive. Then, when I restarted my machine, Windows wouldn't boot, citing a missing or corrupt SYSTEM folder.

How do I re-enable the system hard drive as my primary active partition? Any help would be greatly appreciated.