Have a look at this recent post and try the suggestions there. http://www.mac-forums.com/os-x-operating-system/331829-red-square-finder-icon-macbook-pro.html
Unfortunatly the OP in this post did not reply so we have no idea of the outcome. Always a good idea to use the search box on this site in case your problem has already been solved. Please let us know if this solution works for you.
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