|In reading the first part of your question, I was clearly thinking you probably have an infection (and it wouldn't hurt to scan with Malwarebytes anyway). In reducing the running processes you cut down on heat generating activity within the processor so your system could run longer before shutting down. This is an important clue and since the same things still happens and also happens while in your BIOS, it is clearly hardware related. To take this in steps with the easiest first, I would recommend first running Memtest (burn a CDr and boot to it) to make sure you are not dealing with a bad memory card. While a shut down before receiving any errors will not be conclusive, it is an opportunity to spot an obvious memory problem and shorten the search. Assuming this is not a very new laptop (if newer and under warranty, back up your files and return for warranty repair/replacement) use a compressed air can to blow out any dust from the vents, if possible into the open-able ports and out of the vents. Next install Speedfan and start up. When Windows is up, install speedfan, open it up and monitor your system temperatures. If your temperatures are within reason, try opening up a program in a window while still able to monitor your temperatures. If your system shuts down after your temperatures climb high, you probably have a bad fan or a heat sink in need of reseating, but carefully note which temperatures climb, how fast, and the numbers and post them back. If your system shuts down without your temperatures rising, you will need to look elsewhere. Unless you were able to complete all tests in memtest without errors, I would look back at memory again. If you have more than one memory card, try running memtest again with one RAM stick at a time. Post back your results for additional advice.|
You have to be a little bit crazy to keep you from going insane.
If all else fails, read instructions.