Open: Start → Run → regedit → OK.
Click on: HKEY_LOCAL_MACHINE → SOFTWARE → Clients → StartMenuInternet → You should see the missing browser there. If it's not there, it means that this browser is not installed on your machine. In that case, please install it and try again.
You can also check in this location if you couldn't find it in the above: HKEY_LOCAL_MACHINE → SOFTWARE → WOW6432Node → Clients → StartMenuInternet → You should see the missing browser there. If it's not there, it means that this browser is not installed on the user's machine.