Hi Chris,
Before you revert to the snapshot, please see if you can open the vm in safe mode and install Parallels tools.
To enter safe mode select the vm( but don't turn it on)
from the top menu near the apple select Virtual Machine>Safe Mode
Once the vm has started please install Parallels Tools >Shutdown vm > Apply changes>restart vm normally.
Error: Stop:0x000000c2 This error is usually a driver issue and display adapter (video) driver is the most suspect though it
could be others. Antivirus/antispyware/security programs, hardware (heat) and major software issues
can also cause the error. .... Memory issues are another possibility after drivers.