How do I get back the Internet Explorer Icon ?

Idk what happen to my computer! I A virus ting had poped up on my computer & I just left it alone i didn't even other it... COme to find out my whole computer has turned off & powered back on by it's self.... When I put the pw in all of my icons were gone! & there still gone how can I get back my icons I can't even copy it & then paste it ANy help!!!!!!!!!! The only thing that i was able to copy was some Internet explorer back up shittt & that's not what i want !!!!