RasMan not in reg

im working on a pc that had an error 50 everytime
you would try to connect to the internet using dial up. tried a few things and all i did was make it so you cant setup a new connection (dial up is not selectable) and i was looking around some forums and people were talking about changing rasman in the registry but when i went to try that there is no rasman there please help!!! i would like to try and get around reinstalling xp