I have not really verified but I have the feeling the linux module for that card may not support widescreen modes.
For the Belkin search for ndiswrapper and use the windows inf driver that came with it. Many good post on installing as fom source or through yum which would be the easier for a beginner.
Distribution: RHEL 5.1 with Pieces of this and that.
Kernel 18.104.22.168, KDE 3.5.8 and KDE 4.0 beta, Plus Development src.rpm, ATI fglrx64_7_1_0-8.433-1 rpm with 3D and DRI working.
Acer 5100-5840 with webcam, ati, sdcard reader, sound, atheros based wireless, all working. Only thing not working is the memory stick reader.