See the very brief Wiki article below on how to upgrade your LinuxMCE-0710 installation so that it will auto-detect a Kworld KW-DVB-T 399U DVB-T usb stick;
http://wiki.linuxmce.org/index.php/Kworld_KW-DVB-T_399UThe upgraded v4l-DVB modules installed by this lib will allow the 399U to be auto-detected correctly and will also improve support of other newer DVB-T tuners too.
All the best
Andrew