How do i make elements 10 the default for opening jpg images.

since upgrading from elements 7 to elements 10 i can't get my jpgs images to open in pse as the default. if i right click on an image to bring up the "open with" dialogue box , pse 10 isn't listed as an option. if i click on "browse" and pick pse10.exe from the programme files it doesn't accept this.

i wondered if it was because i hadn't registered the new programme, but i have since registered it and the problem is still the same.
glad of any suggestions
martin