Understand that Driver Verifier is purposed with the intent of catching driver bugs and crashing the system as a result. While you may have resolved your current symptoms by turning off Driver Verifier, there is often a good reason why it's crashing the system, because it's alerting to something that if left unresolved will cause crashing or worse issues. There are cases where 0xC4 bugchecks can occur even without DV being enabled, because some DV checks are internally embedded in Windows 7. If you are not aware of ever turning on DV, then most likely this is what happened, and 'turning it off' won't resolve anything since it wasn't active to begin with.
Anyways, aside from only finding out a general idea what happened from the bugcheck code, there's no telling what caused it without access to crashdumps. However, I perused your syslog, and what concerns me is that while the sylog reported 3 BSODs, there is a ton of unexpected shutdowns reported. Are you manually restarting your system often? Usually when there's very few or no BSODs reported in the system event log, and there's plenty of unexpected shutdowns reported, that means there's some sort of power of temperature issue going on. Either the power supply is bad (most likely), or the CPU is reaching critical temperature and the mobo is shutting things down in an attempt to prevent a meltdown.
There is of course also the possibility the events are not being written to the log during a BSOD because there's a problem with the drive I/O that's preventing the event (and the crashdump) from being written to the drive. When you experience these crashes, do you actually see a BSOD code pop up every time, or does the system just restart? Try typing advanced system settings in Start Menu, then go to Startup & Recovery and uncheck Automatically restart, then restart the system. From now on any time it actually BSODs it should not restart the system but stay at the blue screen. If you still end up getting restarts, then I reckon it's most likely a power supply issue.
This is all I can do for now with the data we've got, outside what John already alerted too. We'll see if 'turning off' Driver Verifier actually manages to stabilize things or not before proceeding.