What issues were you having with the quest exactly?If you are in v 1.1 and can't report Winston as you don't have his icon in your inventory after checking his desk, then please try to talk to Winston in the sparring field, you should have the choice to report him then.
Right now I'm still figuring the issue with v 1.2 in some computers, especially older ones, so if you have v 1.1 and want to play the game, that's the fix for Finding the Culprit quest for now, so sorry
Can I know what version of windows you have?