It's probably safest to clear the tables. Although you can't clear them completely since there is some data that needs to be there. It's a bit of a hassle I know, but what you'll probably want to do is delete the tables, and reinstall. Then what you could do is backup the database after the install, so if you encounter any problems again you can just restore that backup. We'll hope that this fixes the problem so you won't have to do that though
