Cant load desktop or log in

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Hello,
I think my computer is fighting itself over anti virus again.

It turns on to the main image screen but as soon as i click or touch a button it shuts down then reloads the same screen.

I cant type my password or try to log in.

F8 causes the same response. I have Windows 10.

Any help very appreciated. I can't afford a new computer!

Thanks!