If you're using Windows Vista, go to "C:\Program Files\BearShare\db" and delete all the library
files. (Just the ones that actually have "library" in the filenames).

Then, go to your downloads folder and move out all the files to anywhere else.

Then, start BearShare and go to the Views menu, then Enable Views and disable the Library View.

If you're not using Vista more info will be needed, which you can gather by using BearDiag.