Hi there ImNotASheep,
Is this a secondary drive? If it is, and it is a new one, you need to go to Disk Management and initialize -> partition and format it.
In case the drive is not recognized by Disk Management, you need to go to BIOS and see whether it is recognized over there. If not, you need to double check your connections: both SATA and power cables. You can connect the drive to a different SATA port as well.
How to initialize a drive:
http://products.wdc.com/support/kb.ashx?id=Q7LbcX
Hope this will help,
D_Know_WD