Problem with "Open With" menu
Logout and then Login.

It's common for this to happen. If the problem doesn't fix itself upon logging back in it's just a matter of Rebuilding the Launch Services.

Try it this way:


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


Alternatively, you can use the commercial utility MacPilot: