Can´t connect to wireless network | unable to proceed installation

Hello everybody!
After using Ubuntu for about two years I´d like to use another Linux distro which suits my requirements better and ArchLinux seems to be the best solution for me. Anyway I got some trouble with the installation.
I´m using the beginners guide from the wiki and this video as a reference while installing but I got stuck at the point when setting up the wireless network.
wpa_supplicant -Dwext -ieth1 -c/etc/wpa_supplicant.conf & >/dev/null
... outputs...
eth1: WPA: Invalid EAPOL-Key MIC when using TPTK - ignoring TPTK
eth1: WPA: Could not verify EAPOL-Key MIC - dropping packet
(this is the same error message btw)
It shows up this message every two seconds without stopping. The only thing I can then is shutting down my laptop and start from the beginning.
I also tried using netcfg but without real success. There it doesn´t complain but I don´t got a working connection either.
Another odd thing is that if I type
/arch/setup
to begin the actual installation it says "no such file or directory". Any ideas what needs to be configured before or what I am doing wrong?
Any help is appreciated!

maddin wrote:
Ok, I followed the beginners guide now bit by bit. After entering the command
wifi-menu eth1
I can select my network and enter the key which then displays this message:
nl80211: Driver does not support authentication/association or connect commands
Failed to connect to wpa_supplicant - wpa_ctrl_open: No such file or directory
I tried to install the firmware as the wiki suggests it but I didn´t succeed in using pacman as it doesn´t seem to find the required package (ipw2200-fw).
So how do I get this package then?
Dude. Use you wlan interface not the ethernet one.
Eg: wifi-menu wlan0

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