Cant detect wireless network

Hello I am Juan

I have installed a few days ago a wired connexion to my laptop (Compaq Presario C700) with the command line pppoeconf. I am using Ubuntu 9.1. The wired connexion is just fine, but my computer does not detect any wireless network anymore. Any ideas on this?

This is what I get when I insert the command lshw:

 *-network DISABLED
       description: Wireless interface
       product: AR5001 Wireless Network Adapter
       vendor: Atheros Communications Inc.
       physical id: 0
       bus info: pci@0000:01:00.0
       logical name: wlan0
       version: 01
       serial: 00:1e:4c:9a:00:0d
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=ath5k latency=0 multicast=yes wireless=IEEE 802.11bg
       resources: irq:16 memory:91300000-9130ffff
  *-network
       description: Ethernet interface
       product: RTL-8139/8139C/8139C+
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 1
       bus info: pci@0000:02:01.0
       logical name: eth0
       version: 10
       serial: 00:1b:38:e7:85:44
       size: 100MB/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=8139too driverversion=0.9.28 duplex=full latency=64 link=yes maxlatency=64 mingnt=32 multicast=yes port=MII speed=100MB/s
       resources: irq:16 ioport:1000(size=256) memory:91200000-912000ff