Dock icons invisible

Hi all,
I have a 1-year old Mac Book Pro, running Snow leopard. Since last week I have weird troubles with it. Some applications icons started disappearing: the slot is still in the Dock and in the list of application currently running (cmd + tab), but it is empty. Meanwhile, the applications are still working fine...
I installed Parallel Desktops two weeks ago. I'm guessing some folders might have been corrupted in the process, though everything went smoothly.
Any idea so as to what it could be and how to correct it?
Thanks!!
Sincerely
Fr
Message was edited by: barbufou

Start with resetting the LaunchServices database. Launch the Terminal.app in /Applications/Utilities/, copy & paste this one-liner into the window that pops up, hit the return key, and when you get a new prompt, quit the Terminal app and restart:
*/System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchS ervices.framework/Versions/A/Support/lsregister -kill -r -domain local -domain system -domain user*

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