MSDE has been uninstalled from my SBS, I then followed this article to set it back up. Once then I was able to browse an new unmodified companyweb site, although it is full of "wepart errors".
Now I am trying to restore my companyweb database, following this article but it fails at step 11.e. I got a message telling me that it cannot connect to the configuration database.
This issue has been crushing my head for the entire last week, and I'm totally out of hope on this one.