Can't connect wireless from a Win98 PC

I'm trying to connect a PC with Win98 by means of device D-Link DWL-G122 to
a WLAN managed by wireless router D-Link DI-524 (managing also 2 PCs on a
LAN) and I don't succeed in pinging the PC notwithstanding the icon on tray
bar says it is connected. Now by running the configuration utility of DWL
adapter I set:
mode Infrastructure, channel 6, no encryption for now
and in Control Panel - Network - TCP-IP Dlink adapter: Primary access =
client for MS networks;
Configuration: DNS deactivated, IP address automatically provided by DHCP,
WINS config = from DHCP, gateway = IP address of router; Netbios cannot be
enabled (gray square)
Identification: Workgroup= the same of the other PCs
Access control: sharing level
-- When starting the PC, I see on the DWL adapter the link light on and
activity light blinking, but as soon as the icons appear on the desktop the
activity light goes off - and then pinging gets no answer
Someone can help? Is there any problem in mixing WinXP and Win98 on a
network?
il barbi