The nag-screen below may be a problem if you have purchased the personal version first and then purchased the professional version.
You can delete this from Plot->Layout->Edit… to open the dialog box shown below.
Click the Panel tag, then click the button to remove the nag screen.
To remove the footer text shown above push the F6 key again if you need to open the dialog box shown below.
Click on the Titles tag, then make sure is selected. Then delete the text “WinMLS2000 Personal ...” shown at the very bottom of the dialog box. That should do it.
Note that you may want to store the setup from Setup->Store….