Before relaying what worked for me I will preface it with this info:
Phone: Curve (8330)
DM: Version 4.7
I was getting the error message as well. I tried many of the things that apparently worked for others with no success. After trying the fix that includes deleting the Media Manager folder from the Roxio directory and renaming the Media Manager folder in the Application Data folder I couldn't even click on the "Start" button in Media Manager. I then did a repair using the install for 4.7. After this ran I was prompted for a restart. Upon restarting I was able to open Media Manager with no problems. All in all I would say that trying a repair on the install would be the way to go before deleting directories. Just my two cents. Hope this is helpful for someone.
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