I cannot get the Routing and Remote access service to start, and when I try to set up an advanced connection it hangs after choosing "host" and "next" when it should give choices like infrared, etc. I have done several of the things suggested here in other posts, icluding importing the RAS registry key from a working XP Pro computer, setting all the permissions to "allow" for everything, deleting the EAP 25 and 26 folders from RASMAN, etc., etc. The one error I inevitably get in the Event Viewer is "Unable to load C:\WINDOWS\System32\iprtrmgr.dll", but that file is present, current, permissions allowed. I found some Microsoft articles referencing this issue with iprtrmgr.dll and have followed all those instructions, but still get the error.
I have also tried to get a dialup connection to work with an ISP (Earthlink) but it always connects and gives the error 172--wrong protocols. It does this, too, on AOL dialup, so I don't think it's the ISP. I think this may be all part of the same problem, but I don't know.
I do have a working XP SP2 computer from which I can export and import any keys that are necessary.