some weeks ago my wireless stopped working and I fixed it by adding a # to /etc/modprobe.d/blacklist-ath_pci.conf

I don't know if that had something to do but today my wireless stopped working and when I restarted my computer it said that wireless was disabled and when I right click the enable wireless option is grey and I can't click it,

when I run iwlist scan I get this:

felipe@felipe-laptop:~$ iwlist scan
lo Interface doesn't support scanning.

eth0 Interface doesn't support scanning.

wlan0 Failed to read scan data : Network is down
when I run iwconfig i get this
felipe@felipe-laptop:~$ iwconfig
lo no wireless extensions.

eth0 no wireless extensions.

wlan0 IEEE 802.11bg Mode:Managed Access Point: Not-Associated
Retry long limit:7 RTS thrff Fragment thrff
Power Managementff

does somebody know what I can do

ps: I'm have Ubuntu 9.10 and my wireless car is Atheros Communications Inc. AR5001 Wireless Network Adapter