My old PC,Can you help me.

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OK here comes weird story... get ready.
So my PC was old and full of viruses.But i could run Tf2 and some other first person games.One day my brother(as my pc is open and without steel protection to keep him from over heating)Maybe that is not why the pc turned off.. but my brother somehow got the pcs ventilator and pc turned off.(or maybe he had major crash) when i comed back from school it was down my mum helped us to repair ventilator and get pc on. After that moment no first persons of any kind(Only ones whit 8-bit or 16-bit 3D) worked on my pc. But then other games that are imposeble to work on that bad pc start working, i never tried playing VC or SA on pc before so i give it a try.As you may know why buying game on a pc that is full of viruses if you can just download it from the sites...So i downloaded VC it was working perfectly no blue screens anything. but how the years go off i downloaded so programs and some other games that are deleted now bicause to make some free space.My pc is now crashing realy hard it wasnt crashing until i downloaded SA.(well there was no blue screens idk if it was still restarting when over heating)Now i get blue screen whatever i do.I go on net i get blue screen i open program get blue screen.. it was so shocking i deleted(today) all games. Only Vc stayed and Vc is still making my pc crash.I left only Vc because i need to be active to get applyed for a cop of VC.SA wasnt crashing that much as VC but now he is crashing as well.I think my pc is getting eaten by viruses and i need help. I will, maybe, get new pc, but that will be maybe after 2 or 4 weeks and that is to much, my application my get denied i need help to solve blue screen and viruses and over heating...bla bla bla..
I have so problems i cant count them if i had 4 hands.OFC I dont get any help from my big brother( he is always on his fancy lap top) So i dont get help from the mum as well so i need your help guys. help me.