From this post in Ubuntu forums:

cd /cdrom/driver/winxp_2k (browse to the location of the driver file)
sudo ndiswrapper -i mrv8335.inf (your INF file name may vary)
sudo ndiswrapper -l (shows if the driver installed successfully, this should show “mrv8335 - driver installed, hardware present)
sudo ndiswrapper -m (write the configuration to modprobe)
sudo modprobe ndiswrapper
sudo modprobe -r ndiswrapper
sudo modprobe ndiswrapper

“> ndiswrapper -m” didn’t work and
“> modprobe ndiswrapper” results in “FATAL : Module ndiswrapper not found”

That means ndiswrapper module is not installed.

Usnig instructions from this post:

1. Install kernel headers: > apt-get install linux-headers-`uname -r`
2. Install ndiswrapper source: > apt-get install ndiswrapper-source # will be installed to /usr/src/ndiswrapper-source.tar.bz2
3. Build ndiswrapper module: > module-assistant prepare; module-assistant build ndiswrapper

Extracting the package tarball, /usr/src/ndiswrapper-source.tar.bz2, please wait…
Done with /usr/src/ndiswrapper-modules-2.6.18-5-686_1.28-1+2.6.18.dfsg.1-17_i386.deb .

4. Install the built ndiswrapper module: > gdebi /usr/src/ndiswrapper-modules-2.6.18-5-686_1.28-1+2.6.18.dfsg.1-17_i386.deb
5. > depmod -a
6. > modprobe ndiswrapper
7. > ifconfig wlan0 up
8. > iwconfig wlan0 key open 1234abcd56
9. > iwconfig wlan0 essid my_essid_name
10. > dhclient wlan0