laptop running slow

So i was playing a game of csgo when my computer started slowing down and i was getting 20-40 fps where i normally get 60-80?? i closed csgo and opened it again and it was even slower. so i left it alone over night and ive come back to it now and when i run any game it starts of normally at usual fps and 10 seconds into opening it the fps goes back down again?

intel core i7-4610u 2.00 GHz Turbo Boost to 2.6 GHz
8.00 GB ram
windows 10 64-bit
NVIDIA GeForce 820m
Reply to nonly2470
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  1. Best answer
    1. Check for dust, use a torch on the air vents, especially if the fans are more aggressive in cooling is a sign of dust build up.
    2. Check for virus and malware infections.
    3. Usually ignored areas is browser hooks so you roguekiller to check that or adware cleaner.
    4. Use malwarebytes antimalware and emsisoft emergency kit which has bitdefender scanner has well.
    5. Then run command as administrator and type "chkdsk".....this will check if windows are in good shape but also pay close attention to report about bad sectors, if you have bad sectors do not waste time downloading a hard driver s.m.a.r.t diagnostic application just get a new hard drive and back up the failing hard drive to another separate hard drive and reinstall windows on the new hard drive and then port files across.
    6. Finally on laptops eventually inspection of thermal paste on both the cpu and gpu will be required.
    Reply to zer0c007
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