I'm absolutely new to Linux!

My netbook lenovo x61s with Wifi Adapter Intel 3945abg doesn´t connect. The hardware switch is ON and the adapter should work (WinXP is installed on the same machine and Wifi works).

I tried many things that are recommended throughout the Internet, but as Newbie I'm rather typing commands than understanding what I do. I think I even erased the Network Manager... fighting myself through vi-Editor etc. etc.. I think I spent at least 10hours struggling with wifi.

To be honest I am completely lost and this will be my last attempt. Otherwise I will deinstall it.

iwconfig results:
wlan0 IEEE 802.11abg ESSID: off/any Mode:Managed Access Point: Not-Associated Tx-Power=0 dBm Retry long limit:7 RTS thr: off Fragment thr: off Power Management: on
lo no wireless extensions
eth0 no wireless extensions

What shall I do? HELP ME PLEASE!

thanks in advance