How to remove multiple Unarchivers from Context menu

Hi,
I am running Mountain Lion on a late 2011 MBP. Every time I upgrade Unarchiver, it creates a new line item in the context menu. How can I get rid of all but the latest one and how can I prevent this from happening? This seems to be a problem with Unarchiver only, the other Apps don't have this issue. Screenshot attached for reference.
Thanks in advance for your time.

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Abhijit

No one?

No one has an answer?

Thanks to Vansmith for the link:
You can rebuild the database...
Terminal Tips: Rebuild your Launch Services database to clean up the Open With menu | TUAW - The Unofficial Apple Weblog

Thanks, that solved it.