Why system alarm sound when opening an app on my MBP 13"?

Recently started to hear system alarm sound when opening an app., eg. Mail, Safari (usually from the Dock). No apparent operational problem, but quite annoying, especially since I don't know why. Happens on my 13" MBP, but not on my iMac, both running ML 10.7.4.
Repair Disk Permissions and Verify Disk both OK.
Any clues from anyone??

Disable: Play user interface sound effects in System Preferences > Sound > Sound Effects
If that doesn't make a diffeence, check your Dashboard widgets.

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            BANK 1/DIMM0
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        MATSHITADVD-R   UJ-898 
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        Apple Inc. BRCM2070 Hub
            Apple Inc. Bluetooth USB Host Controller
        Apple Inc. Apple Internal Keyboard / Trackpad
        Apple Computer, Inc. IR Receiver
        Apple Inc. Built-in iSight
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        [not loaded]    jp.co.roland.RDUSB0119Dev (1.0.0) [Click for support]
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        [not loaded]    com.adobe.CS5ServiceManager.plist [Click for support]
        [not loaded]    com.mcafee.menulet.plist [Click for support]
        [not loaded]    com.mcafee.reporter.plist [Click for support]
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