Errors importing old database to fresh install

[Nat47]

Here is my situation:
I have a database from my site that used to work correctly. I was in the process of upgrading to a different server, and the import won't work. So, I have made a local test server. I was able to install vB and everything fine. However, when I imported the database, the links (such as seen on the right hand side) always link to wrong threads. Secondly, some threads have a user that posted the original thread, and the thread is viewable from the forum page, however when you click the link you get directed to the post reply page. When you click post, nothing happens and it states an error. Additionally, when you click the user's name that started one of these threads, it gives an error saying that the user isn't registered, although the user does exist in the database and does appear in the members list when viewed in vB.

Is this an error in database formatting or what? Should this be fixed through SQL or is there a way to fix it through impex/admincp?

Secondly, I have an error with the theme. The color scheme shows up fine, and the layout is fine, however none of the images are present you only get the broken image placeholder. The image file exists and is in the correct directory. What is likely the problem here?