Delete them. Poser is very persistant in searching for them. If you need to remove the beta the best bet would be to reinstall poser and move your old data. You can copy just the old dll, rsr, exe and other files back, but it is hard to get them all. That is why I normally tested the betas by renaming my poser 4 directory, installing a new poser 4 copy, then, if it seemed stable, copying the old data in. But you have to be careful to just copy the new stuff you did, not the old version of the libraries. A a pain, but it seems safer. And I have a lot of free disk space.