I've been playing Oblivion for some time, but decided to try Morroblivion today. I used the portal spell to get to Morrowind, but now I don't know how to start the main quest. I've actually never played Morrowind before, and bought it on sale solely to play Morroblivion. According to the Elder scolls wiki, in the original game, I'm supposed to talk to a guard after creating my character to get some documents to deliver. When I go into the house where you're supposed to go, and talk to the person sitting, the game freezes and I can't move or do anything except pausing and loading an older save.
If I avoid him, I can't get through the door where I'm supposed to get the documents, as it needs a key. Can I only start the main quest by starting a new game in Morrowind? I'd be kinda sad to leave my first character now, after 53 hours of playing as her...
Thanks for reading! :)

I recommend you start a new
I recommend you start a new game in Morrowind, is what I did and worked. Or try to reinstall your Morroblivion.esm, it might work too.