Open With - Change All; Not maintained and lost after restart; Help!

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Open With - Change All; Not maintained and lost after restart; Help!
I'm loosing my open this file with this application default settings. I've been experiencing it with PDF files and preview app. The finder will default back to preview after I continually reset all PDF files to open with Acrobat.
Oddly this is also happening with Entourage. Frequently between restarts the finder asks if I want to make Entourage my default email app.
Why is the system loosing the default settings so frequently?
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Repaly
Try rebuilding the launchservices database:
Rebuild LaunchServices Database
For Tiger users
Open the Terminal application in your Utilities folder. At the prompt paste in the following command in its entirety:
/System/Library/Frameworks/ApplicationServices.framework/Frameworks/LaunchServic es.framework/Support/lsregister -kill -r -domain local -domain system -domain user
Press RETURN.
For Leopard users
Open the Terminal application in your Utilities folder. At the prompt paste in the following command in its entirety:
/System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchSe rvices.framework/Versions/A/Support/lsregister -kill -r -domain local -domain system -domain user
Press RETURN.
You will get prompts about using applications for the first time but that's normal after the rebuild.
As for the default mail program you should open Mail, select Preferences from the Mail menu. Click on the General icon in the toolbar, then set the Default Mail drop down menu to the mail program you want as the default - in your case Entourage.
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