Firstly run lspci as root (su -) & you may see (actually should see) the following
02:09.0 Network controller: Texas Instruments ACX 111 54Mbps Wireless Interface
the Texas part is the chipset (T1). I have this card running perfectly using ndiswrapper
along with the windoze drivers. You will not get them working with the ACX 100 drivers but maybe with the ACX 111 (I couldn't when I first tried a couple of years back) Once I manged to get the card working correctly I have never had any problems with ndiswrapper (using 256 WEP) connecting to a USR AP. Heres a copy of the output using iwconfig as root
wlan0 IEEE 802.11g ESSID:"XXXXX" Nickname:"emachine.local"
Mode:Managed Frequency:2.462 GHz Access Point: xx:xx:xx:xx:xx:xx
Bit Rate=125 Mb/s Tx-Power:10 dBm Sensitivity=0/3
RTS thr=4096 B Fragment thr=4096 B
Encryption key:xxxx-xxxx-xxxx-xxxx-xxxx-xxxx-xxxx-xxxx-xxxx-xxxx-xxxx-xxxx-xxxx-xxxx-xx Security mode:restricted
Link Quality:100/100 Signal level:-50 dBm Noise level:-256 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
Is there any particular reason for wanting to use the ACX driver?