I think my Pc has a serious malware,pls help asap

[Windows 10]

First of all I can not do an antivirus check,no smarscan no full scan, my other antivirus app Norton 360 showed me there is a error allthough when I click on fix it it shows me an error"fix not possible" ,also the scariest thing is, that I can not open my Folders,it just opens and than it freezes I can not click on it and after a while I get a black screen and I can only navigat with alt+tap, I really dont know if this has anything to do with the fact that I still have windows 10 or something like just my pc beeing extra slow for some reason, but my biggest fear is a malware and to be honest

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