You have a brand new installation, with a new server, ms windows 2008r2 server and hyper-v.
You see frequent blue screens (or unexpected reboots) with event log entries
0x00000101 (0x0000000000000019, 0x0000000000000000, 0xfffff88001e5d180, 0x0000000000000002)
MS is aware of the problem and has a hotfix they provide on demand.
More details can be found here:
Looks like the Hyper-V stuff is still somewhat beta quality.