It looks like you're still using the Win8 Release Preview. I suggest that you update to the RTM version ASAP - it fixes a lot of the bugs present in the Release Preview (I'm still running the Release Preview because I haven't had time to upgrade all my personal programs/settings - and I still).
The last 10 memory dumps are primarily memory or memory access errors. This is probably a driver issue, but you'll have to rule out memory issues in order to be sure.
Try these free diagnostics: Link Removed
Each of the tests will test a system component that has some affect on your system memory - so please run them all and let us know the results.
Once that's done (and everything has passed the tests), then run Driver Verifier...