WMC is not recognizing Radio

I have recently bought a DVB-T TV\Radio tuner (usb stick)
The brand is a localized one existing only in Greece (Turbo-X)
link translated: Google Translate
Anyway, the thing is that although it is fully functional (TV+Radio) with the software it comes with(ViVaTV\ViVaRadio), when i use it with WMC only the TV works
On Music>Radio tab shows "to play FM radio, you must first install a radio tuner"
Any Ideas??

Useful info: I believe the whole product is an almost exact copy of one of the Kworld's tuner sticks, because the software that comes with the tuner is directly from Kworld Multimedia (with a tiny amount of name editing) and the remote control is identical to Kworld's remote (which is ,by the way, set up for WMC and not for ViVaTV).