I have an idea on what is causing your crashes, similar problem happened to a friend of mine. You have the Intel BLKDH55HC or BOXDH55HC motherboard right?
If so, go into the bios, on the security tab there should be three options:
Intel® Virtualization Technology
Intel® VT for Directed I/O (VT-d)
VT Technology or XD Technology or NX Technology or any combination of these
if you have these options let me know and I can tell you what my friend did to fix the graphics issue!
I hope I can help,