Computer wont start after norton restart request and Trojangen2 warning

There was a Norton message that Trojan.gen.2 error in the bottom right corner of the screen saying that it is processing.  My Dell Alienware desktop Computer froze for about 3 minutes.  then Norton said that trojan.gen.2 has been resolved and gave the restart menu - requesting a restart - clicked restart now --  computer will not come back up, we see a blue screen with a leaf and an arrow on it.  If we do a hard reboot we get two options, one is to fix the restart files, the second is to restart windows normally.  Both restart options result in the same blue screen with the leaf.  We can move the arrow around the screen, but that's about it...  Any support is welcome, TIA!