Restarts by itself without warning.

Sometime my computer randomly restarts by itself. While playing, or just checking the internet. The screen turns black and it restarts. There is not really a pattern to it, it just randomly restarts by itself sometimes.. And i've tried several solutions which did not work.. It also once game me the "Blue screen of death" Telling me that the system ran into a problem and had to be rebooted. The error was called "SYSTEM_SERVICE_EXEPTION (cpudrv64.sys)

I also checked the recent errors on my pc.
Microsoft-Windows-Kernel-Power 41 (63)

I'm getting kinda desperate! :-)