MSFT = Microsoft.
You can put abbreviations and words in all capital letters on google.com for faster answers.
Some folk call a reloading of the OS "formatting" or something else. Your post is too slim on details and without more clues I can't guess if this is some virus or much else.
Given the model and age it's not usually the issues you are having but it appears you don't do your own repairs or maintenance so let's start with what a person does before they take it to the shop.
-> It's odd you write the heatsink is fine and I'll agree that it is. However I am always cleaning client's laptop vents and heatsinks and if it's over a few years we replace the heatsink compound.