Anthony 07 :
No i am not overclockin, and my frivers are all up to date, i use windows 8, and never installed other since i bought this pc in june
Down load Fur Mark and run it to monitor how hot your GPU is getting. You can find it
here
Also, did you get any Blue screen or Windows errors when it reboots? You might want to check on the Event Viewer.
Open Event Viewer by clicking the Start button, clicking Control Panel, clicking System and Security, clicking Administrative Tools, and then double-clicking Event Viewer. Administrator permission required If you're prompted for an administrator password or confirmation, type the password or provide confirmation.
Look under the System logs on the pane, for any warnings that may indicate what is going wrong on your system.