Have look here:
http://www.linuxwireless.org/en/user...1211rw/devices
Looks like you have the Zydas chipset.
You can try this Debian package: zd1211-source (apt-get install zd1211-source)
You'll have to also install module-assistant if you don't have it already. As root, try running m-a from a command line. If it's there, it'll bring up a semi-graphical interface to walk you through the process.
First time is the hardest.