I need to stop beng vilified with the powder gangers so I can retake the prision. How do I do that? Also I tried a disguise but it didnt work.
Ok, there is a solution, but I don't think you're gonna like it. You can use the console commands (assuming that you're playing on the PC) and enter the proper codes to adjust your reputation to how you see fit. However
(This is very important!!!) Doing this
will forfeit your achievements. So, if you don't care about achievements, then by all means have at it. http://fallout.wikia.com/wiki/Fallout_3_console_commands#Stats_and_character_manipulation should help get you started.