Repeated applications under Open With Menu Possible Duplicate:
  Why does my Mac’s list of “Open with” applications start listing the apps twice and sometimes three times?  




When I right-click on a file and select Open With option, I see many repeated applications:



How do I get rid of these repeated options?
Open Terminal and type the following 


  /System/Library/Frameworks/CoreServices.framework/Frameworks/LaunchServices.framework/Support/lsregister -kill -r -domain local -domain system -domain user


Then restart or log out and log back in, this should fix the problem.