Acer ASPIRE ONE D257 Freezes and switches off

So, hello guys! My girlfriends acer started to run slowly. So, i gave it to a "specialist". Nothing happened. The notebook is out of warranty since a long time. OK, so i cleaned the unnecessary programs - no result. Next steps. I reinstalled windows - it works for a while. It runs W7 Ultimate. I didnt replace the thermal compound. It started to freeze a couple of days ago. So i opened the notebook and i cleaned the dust. I replaced the thermal compound. So it started to switch off after some time of working. The only program i use on it is VIVALDI browser. So my girlfriend can watch her movie, heh :D. Ок, i remembered that there was a thermal pad, wich i replaced with compound so i bought a couple of pads and now it has thermal pads. Still the same, NO result. I switch on the laptop, double click on VIVALDI, i enter youtube or etc and after couple of minutes of work it switches off. Can you help me guys? The notebook is: ACER ASPIRE ONE D257 1.66 GHz 1MB L2 Cache 2 GB of ram Windows 7 ultimate. I installed coretemp so the themps are nasty - above 80 degrees Celsius. The fan works loudly and it blows warm air. I will try to upgrade do Windows 10 because i read that some drivers of Windows 7 could cause this problem, but after updating them there isnt result.

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