Re: Whats wrong with my pc?
Get whichever one is free. I think it's the 'lite' version. But 1st you really need to go in to your BIOS and make sure you CPU fan is turned up. You may well be damaging it if it's overheating, as it sounds like it is.
Also, get some Arctic Silver 5 thermal paste. Most PC shops will have it. Apply it as described on their website. Getting a good paste will help, but applying it correctly is an absolute must.
What cooler is it?