|Your temperatures look ok (not really excellent, but ok). Use a can of compressed air to clean your box. DO NOT use a vacuum cleaner.|
To have the system show the Blue Screen and not reboot, do the following.
1. Click Start, and then right-click My Computer.
2. Click Properties.
3. Click the Advanced tab, and then click Settings under Startup and Recovery.
4. Under System failure, click to clear the Automatically restart check box.
5. Click OK, and then click OK.
I would suggest checking your memory. Memtest86 is a good free memory tester. Find and download it. Run it for a few hours, 'at least'. I run it overnight. Any failures at all are unacceptable.