u/GodUnkomplex

I'm worried I have granted access to an attacker to my PC when I used someone's USB (trojans), I'm afraid my PC will be controlled and lose my files. What do I do? Should I immediately disconnect PC from WiFi (already did) and remove battery so my PC won't be controlled or hijacked? I cannot turn off router, others are using it.

Edit: Thank you everyone for your assistance I will be dealing with this situation swiftly with all the advice you give. I hope good things come to you all.