Unable to start network interface

Hi

(sorry for my bad English)

I'm trying to configure an US Robotics (USR5423) wirless usb adapter on Fedora 9. the device is detected, and i'm trying to configure a wireless connection.
When I want to activate the device using
#service network restart
or
# /etc/init.d/network restart
the following errors are shown:

Shutting down device wlan0 - [Failed]

Bringing up interface wlan0 - [Failed]
: Error for wireless request "set mode" (8B06) :
SET failed on device wlan0 : Invalid argument

Determining IP information for wlan0... Failed

After these error messages the SE troubleshoot browser pops out with an AVC denial:

Summary: SELinux is preventing the semodule from using potentially mislabeled files (/home/Teis/.xsession-errors)
It tells me that i have to relabel the file and the whole directory using restorecon.
After doing this, and restarting the network services, the errors (and the acv denial) were still there

I realy hope someone can help me (please explain everything clear, because i'm a linux newbie ;))