trojan then black screen on boot up FIXABLE?

i accepted a trojan virus then it displayed a bunch of ways to accept mutiple anti-virus programs , at that point i unplged the computer . So now every time i BOOT up the computer it runs but displays nothing on the screen , then i tried F8 boot up ;didnt work .. Hold [Ctrl] [Alt] [Del] , Now it says quote ( "Enter CURRENT Password " ) . Is this FIXABLE !!!!!

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