I found out badly answered/voted question: disable the F1 key for whole system
And I hope it gets more attention, so the "best answer" could be the right one (the regedit thing). Just to help out people who googled it like I did! I wasted plenty of time debugging my program when I wondered why my F1 key didn't work anymore; I thought I had a bug somewhere, but then I remembered I disabled the F1 help-key many weeks ago!
Edit: I did vote that answer up, but it had -1 votes before i did so. I also edited the answer to make it more pleasing to l33t people.