This post is a few days old, but this is the way I did it. This article is for ubuntu but a few changes
and it worked on slackware with the same card that you have. So it will surely work on arch with a few changes!
For the first I removed ndiswrapper
$ sudo apt-get --purge remove ndiswrapper-*
after I went
http://sourceforge.net/projects/ndiswrapper/files/
and I downloaded the testing version (but I think the stable work well too)
I unpack the file and copy the directory in my home user /home/luca
now with bash I reach the directory
$ cd /home/luca/ndiswrapper
do the command :
$ make distclean
$ make -C driver clean
now install with commands
$ make
$ sudo make install
now reach the windows files
$ sudo ndiswrapper -i /home/luca/wg111t/netwg11t.inf
I check
$ ndiswrapper -l
netwg11t : driver installed
device (1385:4251) present
I mount the drivers
$ sudo depmod -a
(was here the errore Fatal etc.)
$ sudo modprobe ndiswrapper
now my wifi card is lighting
For run the wifi card on boot :
$ sudo nano /etc/modules
and write of the end ndiswrapper :
# /etc/modules: kernel modules to load at boot time.
#
# This file contains the names of kernel modules that should be loaded
# at boot time, one per line. Lines beginning with "#" are ignored.
lp
ndiswrapper
I hope this is helpful for someone