External hard drive connected to Airport Extreme not working on PC

I have a Macbook Pro running 10.9.1 and my work laptop, which runs Windows 7. I have a WD 2TB external hard drive connected to my Airport Extreme, with 1TB formatted for Mac and the other 1TB formatted in FAT format. My Macbook can connect to the drive and read/write perfectly fine, but I'm not even seeing the drive on my PC anywhere. I'm wanting to use the Mac formatted partition to backup photos and personal documents and the FAT partition to backup my work.

Is there a setup thing I need to do on either the Airport Extreme or on my PC to connect to have the drive visible? Both drives are setup to allow file sharing and my Airport Extreme is running version 7.6.4.

Thanks!