|It would be helpful to know what temperatures your computer components are running at... And maybe you could broaden the description on what sort of tasks it shutdowns, on what website/websites it freezes and what security applications you have installed (antivirus, spyware, etc.). |
I don't think the Power Supply has to do with the problem because if it did, your system wouldn't even load or not even run the fans. Speaking about fans, it would be helpful to know if the processor fan is working at full capacity because if it works at a lower than necessary speed the processor would overheat.
I would suggest you install a System Analysis application such as FreshDiagnose to take the Processor, Harddrive, Motherboard and Auxiliary temperatures, and also the Processor fan speed. Another application that could help determine what the actual cause is "BlueScreenView"... It could recover the information and error codes contained in the Minidump file that saves what you see in the Blue Screen of Death... I would suggest you leave that application running so it monitors the next crash readings directly.
Download both applications from this website
Install FreshDiagnose and from the Icon Bar, check "Hardware" and under Hardware System, click on Sensors and see on the right pane what temperatures the system registers and post here the results.. take several readings restarting the application some three times to get an average of component temperatures and fan speeds. This is important because component temperatures are not constant and Fresh Diagnose takes a readings as it starts and keeps them all the while it's so we need an average over a few minutes timespan. Other applications of the type take real time readings but in my experience those readings keep changing fast and it's hard to determine what the actual temperature is for a given component.
You could also remove unessential peripherals and drives to determine if any of them causes the problem
Do this to helps us pinpoint the problem.