Here's what I did and it worked pretty well.
In windows explorer find your "hosts" file:
C:\WINDOWS\system32\drivers\etc\hosts
Right click and select properties and make sure "read only" is unchecked.
Open the "hosts" file in notepad and add the following line (without quotes)
"127.0.0.1 www.moovielive.com"
Save the file.
This blocks access to moovielive.com so when you launch PowerDVD, it will be much cleaner. You may still get that silly girl grinning at you, but you won't get the e-mail sign-in box, or the DVD thumbnail pictures.
Be advised, however, that your browsers won't be able to access moovielive.com either.