I am getting some memory_management BSODs sometimes when using your miner, I have two reaper miners, both set to automatically start when I run it. I'm not sure if this is reaper's fault or the guiminer's though.
I have had two things causing BSODs while mining with reaper/cgminer:
1) Memory on motherboard is bad.
2) GPU is bad or seated improperly in the board/riser.