System Reserve keeps getting mapped as C: drive in Windows 7?

My PC keeps doing this.

Volume 2 is the ACTUAL C: drive with the Windows install. Diskpart lets me reassign the letters, but reverts back to what you see in the image when I reboot. Startup repair does nothing as well.
I can browse volume 2 through the command line, so my drive (OCZ SSD) doesn't seem to be faulty.

This is out of the blue, I haven't installed or updated anything recently.
Any suggestions?