WIFI stuck on requesting network address then disconnects

Hi, I just installed ubuntu 8.1 and i can't seem to get the wifi working at all. It's running on a compaq evo d510 smf, p4 2gh. I am also running XP pro sp2 and wifi works perfectly on that. I have done some commands and i hope that helps to figure out the problem, here they are...

onur@onur-desktop:~$ sudo lshw -C network
  *-network:0
       description: Ethernet interface
       product: 82801DB PRO/100 VM (LOM) Ethernet Controller
       vendor: Intel Corporation
       physical id: 8
       bus info: pci@0000:05:08.0
       logical name: eth0
       version: 81
       serial: 00:0b:cd:27:ca:47
       size: 10MB/s
       capacity: 100MB/s
       width: 32 bits
       clock: 33MHz
       capabilities: pm bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=e100 driverversion=3.5.23-k4-NAPI duplex=half firmware=N/A latency=66 link=no maxlatency=56 mingnt=8 module=e100 multicast=yes port=MII speed=10MB/s
  *-network:1
       description: Wireless interface
       product: Atheros AR5001X+ Wireless Network Adapter
       vendor: Atheros Communications Inc.
       physical id: 9
       bus info: pci@0000:05:09.0
       logical name: wifi0
       version: 01
       serial: 00:17:9a:c9:91:0e
       width: 32 bits
       clock: 33MHz
       capabilities: pm bus_master cap_list logical ethernet physical wireless
       configuration: broadcast=yes driver=ath_pci latency=168 maxlatency=28 mingnt=10 module=ath_pci multicast=yes wireless=IEEE 802.11g
  *-network DISABLED
       description: Ethernet interface
       physical id: 1
       logical name: pan0
       serial: c2:a0:de:9b:1d:f9
       capabilities: ethernet physical
       configuration: broadcast=yes driver=bridge driverversion=2.3 firmware=N/A link=yes multicast=yes
onur@onur-desktop:~$ iwconfig
lo no wireless extensions.

eth0 no wireless extensions.

wifi0 no wireless extensions.

ath0 IEEE 802.11g ESSID:"" Nickname:""
          Mode:Managed Frequency:2.437 GHz Access Point: 00:13:46:AC:B3:2A
          Bit Rate:0 kb/s Tx-Power:18 dBm Sensitivity=1/1
          Retry:off RTS thr:off Fragment thr:off
          Power Management:off
          Link Quality=0/70 Signal level=-96 dBm Noise level=-96 dBm
          Rx invalid nwid:1808 Rx invalid crypt:0 Rx invalid frag:0
          Tx excessive retries:0 Invalid misc:0 Missed beacon:0

pan0 no wireless extensions.

onur@onur-desktop:~$ iwcfig
bash: iwcfig: command not found
onur@onur-desktop:~$ iwconfig
lo no wireless extensions.

eth0 no wireless extensions.

wifi0 no wireless extensions.

ath0 IEEE 802.11g ESSID:"Ayyildiz" Nickname:""
          Mode:Managed Frequency:2.437 GHz Access Point: 00:13:46:AC:B3:2A
          Bit Rate:54 Mb/s Tx-Power:18 dBm Sensitivity=1/1
          Retry:off RTS thr:off Fragment thr:off
          Power Management:off
          Link Quality=35/70 Signal level=-60 dBm Noise level=-95 dBm
          Rx invalid nwid:1810 Rx invalid crypt:0 Rx invalid frag:0
          Tx excessive retries:0 Invalid misc:0 Missed beacon:0

pan0 no wireless extensions.

onur@onur-desktop:~$ pci+noacpi
bash: pci+noacpi: command not found
onur@onur-desktop:~$ pci=noacpi
onur@onur-desktop:~$ ifconfig
ath0 Link encap:Ethernet HWaddr 00:17:9a:c9:91:0e
          inet6 addr: fe80::217:9aff:fec9:910e/64 Scope:Link
          UP BROADCAST MULTICAST MTU:1500 Metric:1
          RX packets:24 errors:0 dropped:0 overruns:0 frame:0
          TX packets:48 errors:3 dropped:3 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:3168 (3.1 KB) TX bytes:10029 (10.0 KB)

eth0 Link encap:Ethernet HWaddr 00:0b:cd:27:ca:47
          UP BROADCAST MULTICAST MTU:1500 Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

lo Link encap:Local Loopback
          inet addr:127.0.0.1 Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING MTU:16436 Metric:1
          RX packets:280 errors:0 dropped:0 overruns:0 frame:0
          TX packets:280 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:18080 (18.0 KB) TX bytes:18080 (18.0 KB)

wifi0 Link encap:UNSPEC HWaddr 00-17-9A-C9-91-0E-00-00-00-00-00-00-00-00-00-00
          UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
          RX packets:4436 errors:0 dropped:0 overruns:0 frame:2468
          TX packets:894 errors:0 dropped:3 overruns:0 carrier:0
          collisions:0 txqueuelen:199
          RX bytes:624567 (624.5 KB) TX bytes:69235 (69.2 KB)
          Interrupt:18

onur@onur-desktop:~$ sudo dhclient ayyildiz
Internet Systems Consortium DHCP Client V3.1.1
Copyright 2004-2008 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/sw/dhcp/

wifi0: unknown hardware address type 801
SIOCSIFADDR: No such device
ayyildiz: ERROR while getting interface flags: No such device
ayyildiz: ERROR while getting interface flags: No such device
wifi0: unknown hardware address type 801
Bind socket to interface: No such device
onur@onur-desktop:~$

If you could help that would be great,

Thank you