Why do I keep getting "an unknown error has occurred" when I try to update or add an app?  I have plenty of memory left.  Suggeestions?

Why do I keep getting this message "an unknown error has occurred" when I try to update or load an app.  The issue is not space (memory) as I have 2/3 memory left to use.  Any suggestions?

Hi ...
Installing the OS X Lion Update 10.7.3 (Client Combo) reinstalls the App Store for you which may help. Restart your Mac after the combo is installed.
It's ok to do this even though you are already running v10.7.3.
If that doesn't help, if you have anti virus software installed, disable that.
If you have an app called LIttle Snitch installed, that can prevent apps from updating.

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