Mac OS X 10.7 App Store: "Unable to complete your purchase"

When I try to install an already purchased app, or a new app, I get the error message: "Unable to complete your purchase. Unknown Error".
It doesn't matter which app, paid or unpaied. I've already reset my warnings through iTunes, signed out and in again, restarted, etc.
Is there a way to reinstall or "clean" the "App Store" App?
Roeland

How to re download apps ...
Open the App Store. From the menu bar click Store > Sign In
Click Purchases from the top of the App Store window.
Select which apps you want to re download. Then right or control click where you see Installed then click Install.
Make sure and use the same Apple ID used for the original purchase.
or a new app,
If you still can't re download apps, try deleting the cache associated with the App Store.
Quit the App Store if it's open.
Open the Finder. From the Finder menu bar click Go > Go to Folder
Type this exactly as you see it here:
~/Library/Cahces/com.apple.appstore/Cache.db
Click Go
Move the Cache.db file to the Trash.
Launch the App Store. Try downloading an app or reinstalling one.

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Mac OS X 10.7 App Store: "Unable to complete your purchase"

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