Doing a hard reset as describe above may work but there are other things we can do.
The first thing we need to know is what blue screen error your getting, when you power on the computer start pushing F8 this will take you to the "Advance boot options" in here find and select "Disable automatic restart on system failure" then your computer should continue to load until the error only this time it should stop on the blue screen rather then reboot.
If you can can you please post the information that is on the blue screen. (see below)
The problem seem to be caused by by the following file:_______________
There are lots of things that cause the BSOD (blue screen of death), and even more ways to fix them, let me know mate and we will go from there.