@DeniseSawyer , it was after some Windows updates in my case. On my test laptop which has 3 versions of everything on it. I just ran the PT installer again, let it do 'repair' and it put Pervasive back. Another thing that might break pervasive is any fundamental changes to the machine (client and server both use Pervasive), such as a computer name change. You may need to manually activate Pervasive again, but I think the messaging usually indicates that. Look in the services for Pervasive. It's something like PVSW. If you have an exact error, I can look it up in the KB.