Mustek Wireless Routes

Hi there--

New in wireless

I just got Mustek Wireless Router/access point and tried to build up a
wireless network. Everything seems ok- all the laptops (all 3 of them) are
connected through PCMCIA WiFi cards(different brands), but desktops are not-
I have USB WiFi cards from Canyon (they use amtel chips). We have windows
xp.

I tried one of those cards in public WiFi area and it worked with no
problem, but not in the office.

So my question is- should I try something more, where should I look or
should I just change/buy new acces point or ???

Thanks

Virgo