well, you could read other posts in this section. I've answered your exact same question about 8 times this week. Anyhow, heres what you do.
move your ndiswrapperxx.tar.gz file to a directory where you compile things, i compile most everything in /usr/src/
tar -zxvf ndiswrapperxx.tar.gz
if you get any errors i'd suggest googling for for a package for your distro.
Next navigate to where you have your windows driver file. This file should end in .inf. now type
ndiswrapper -i urdriver.inf
it should say something like this
rt73 driver installed, hardware present
now open up one of your startup files usually /etc/rc.d/rc.local (or something silmilar)
for information on configuring, look at other posts.