Windows 8 trial version blue screen

I have installed Windows 8 64 bit trial version seven days ago. It all worked good until yesterday.
When I started the computer I got an OS error with a blue screen C: Windows / memory.dmp SYSTEM_THREAD_EXCEPTION_NOT_HANDLED.
If anyone knows what it is I would appreciate any suggestions?

Your PC ran into a problem that it couldn't handle,
and now it needs to restart.
