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.
Can you post some type of .log data, something?
I have some memory dump files if you want them.
https://dl.dropboxusercontent.com/u/60526330/Minidump.rarI turned off my ramdisk and it seems to have fixed the problem, but I will have to let my computer run for a few more hours before I can be sure it's fixed.