Virus? Laptop is spinning, what now?

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2

My laptop switched off several times today and did not boot up anymore. He crashed again during the startup. Now I could start it up again, but immediately noticed that the tabs have no cross, so right next to the tabs has always been a cross with me, which is now completely missing. Looks like I have a virus on it or what do you think? And my toolbar has also disappeared and I see the arrow to scroll forward or back just…

Gr

Or you have something installed / updated…

Unfortunately, that can be a lot and by remote statement you can't present because you unfortunately no correct answer; I would then have to chair and try different things to present a result to you.

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I think that was overheated, now he is running again without problems. Do you know if you can check if the fan is working properly or a program where you can check it?