Microsoft has created a guidance page for user on how installing a browser on Windows 7 E, for more information click here

Users that buy Windows 7 E required to install an internet browser from preferred storage device such as DVD, USB or an external storage device.

Meanwhile Windows 7 N does not include a internet browser and media player in order to play or create audio CDs, media files, or personal videos; organize media library content; create playlists; transfer media to portable media players; share photos on a home network; or perform other media player–related tasks.

*Windows 7 E- the version of Windows that will ship in the UK without a browser.