Recently I've updated Lightroom from 2 to 3.4.

Then it turns out that the JPEG files still open in Lightroom 2, so I decided to uninstall Lightroom 2 completely.

After that, I tried to set the default program to Lightroom 3.4, but then every time I tried to select lightroom.exe, it won't appear on the list of programs.

I also tried Control Panel > Set Associations, still doesn't work.

It's getting very stressful, can anyone help me?