Got a trojan while ordering Domino’s pizza—how do I fully remove it?

I swear to God, I haven't been to any illegal websites and haven't viewed any porn sites in months, but suddenl, while ordering pizza yesterday, I got a trojan on my computer> I have tried three antivirus apps so far, and none of them correctly remove it. I've set all my security settings on Microsoft to maximum, and they don't sotp the trojan

This computer is getting pretty old, and I might just trash it now, since it's more expensive to try to save it than to trash it.

Got a trojan while ordering Domino’s pizza—how do I fully remove it?
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