Halo PC online problems

Ok, so for fun I recently bought Halo PC. I just tried to get into an online match and the game said I had to have administrator rights to download the patch. But I am the administrator. So what do I need to do to be able to play online?

I’ve had this issue a few times before. For some reason I don’t know how I solved the issue but, it some how worked after I left it for a day.