wlan0 No such device

Hello,

I want upgrade to a 2.6.7 kernel but I have some problems. On 2.4.26, 
all is OK.
I have installed the 0.12 beta 14 of the driver succesfully but I have 
these errors:

`iwconfig wlan0`
wlan0     No such device

`ifup wlan0`
Error for wireless request "Set ESSID" (8B1A) :
     SET failed on device wlan0 ; No such device.
Failed to bring up wlan0.


Modules are loaded:

`lsmod`
Module                  Size  Used by
parport_pc             41248  1
lp                     12292  0
parport                44040  2 parport_pc,lp
snd                    60388  0
rtc                    14888  0
at76c503_rfmd          43652  0
at76c503               88832  1 at76c503_rfmd
usbdfu                  6720  1 at76c503
usbcore               129728  4 at76c503_rfmd,at76c503,usbdfu

`dmesg`
usbcore: registered new driver usbfs
usbcore: registered new driver hub
/home/vlad/at76c503a/usbdfu.c: USB Device Firmware Upgrade (DFU) handler 
v0.12beta14 loading
/home/vlad/at76c503a/at76c503.c: Generic Atmel at76c503/at76c505 
routines v0.12beta14
/home/vlad/at76c503a/at76c503-fw_skel.c: Atmel at76c503 (RFMD) Wireless 
LAN Driver v0.12beta14 loading


I have a Santis adapter USB, my /etc/modules:
at76c503-rfmd netdev_name=wlan0

Sorry for my bad English ... I learn it since only 2 years ..

Thanks for your help