Wireless network card won't connect to router

[David Whyte]

Hi,

I installed Gutsy on my brothers laptop tonight and everything went
OK, except the wireless network card doesn't seem to work too well.
It can detect my network and when I select my router using Network
Manager it pops up the encryption key dialog.  I enter the key (i use
64Bit Hex) and the icon in the status tray shows that it is trying to
connect, however, it always fails.  Sometimes, after trying a couple
of times, NM crashes and the laptop starts to behave wierd (i.e.
System tools don't show when started, commands run in the terminal
fail to execute, etc) and I have to reboot.

I don't think this is a driver issue as I am at least finding the
router and it identifies that it is encrypted, but I have been stumped
all night.  I am using the acx driver, since this is a D-Link DWL-650+
PCMCIA card.

Does anyone have any ideas?  Would it be worth trying the Ndiswrapper
and would that still behave OK with NM?  Is Ndis as hard to configure
as all the different How-Tos make out?

Any help is appreciated.

Ta,
Whytey