It may be one of the solutions for atikmpag.sys & BSOD error from my experience
my system is radeon 5770(gigabyte) graphic card & GA-Z77X-UD5H mainboard
my OS was windows 8&8.1(upgrade) and recently upgraded windows 10
when I upgrade windows 10, the screen was black ....but intel internal graphic was OK
so I thought graphic card was so old for windows 10 and use internal graphic card for several months
I bought RX460 graphic card last week, but I do not work... just recognized as basic graphic card
and atikmpag.sys error happened when I install Crimson driver
In conclusion, the reason was "Lucid Virtu™ Universal® MVP GPU virtualization" program, which do not support windows 10.
You must uninstall that program before upgrade windows 10
there is no atikmpag.sys/atikmdag.sys files(in case of normal installation) in "windows/system32/drivers" folder, but happens atikmpag.sys&BSOD error
the cause of the BSOD is "virtuwddm.sys",which seems to make virtual atikmpag.sys file.