Fallout Troubleshooting (no pun intended): Can't Pull Out My Weapon

Hi I'm playing a version of Fallout 3 that *may* or may not be downloaded from a torrent, in any case, i was doing just fine until around Little Lamplight I realized that I could not pull out my weapon. I tried switching weapons and even some console commands, but nothing seems to work. I do not have any quick-keys established, and my mouse is working perfectly fine. I can click on everything else in-game, including selecting weapons in the Pip-Boy 3000. What seems to be the problem here?