The system table in Drupal's database store's the location of the module files. Move the module files to their new location, and then manually change those rows in the system table.

I almost told you to disable the Ãœbercart modules, but that causes CCK to delete the tables it makes for the product node types. You probably have a lot of pictures that you don't want to upload again. They should really have some kind of warning about that.