Cannot connect to 3com wireless router

I've had problems with my wireless connection lately. When i start
windows it gets stuck in "acquiring network address" and times out and
I get limited/no connection and no internet connection. I then have to
unplug the usb network adapter and plug it in again. Then everything
works.

I saw some posts with this problem that said it was a problem with XP
SP2 and that the solution was to don't hide the SSID, turn off the
DHCP server in the router and set a static IP for the computer. The
problem is that when I disable the DHCP server in the router (3COM
3CRWE52196) I lose contact with it. I've set the ip address
(192.168.1.x), the netmask (255.255.255.0, same as in the router), and
the gateway address (192.168.1.1), and also the name servers. I then
have to reset the router to the default settings to get contact with
it again. Oh, and it also shows Speed: 1.0 Mbps instead of 11Mbit in
the system tray.

Any solutions?
Regards
Lars Lind