Ubuntu – Can’t turn on or enable wireless

I'm using ubuntu 11.10 for a couple of months.

but Today after restart my laptop I can't get wireless on. I tried to install windows wireless drivers but it didn't work too.

and It's not off by rfkill too.

# rfkill list all
0: hci0: Bluetooth
    Soft blocked: no
    Hard blocked: no
1: dell-wifi: Wireless LAN
    Soft blocked: no
    Hard blocked: no
2: dell-bluetooth: Bluetooth
    Soft blocked: no
    Hard blocked: no

when I tried

# ifconfig wlan0 up
wlan0: ERROR while getting interface flags: No such device

and

# lshw -C network  *-network

       description: Ethernet interface
       product: RTL8101E/RTL8102E PCI Express Fast Ethernet controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:05:00.0
       logical name: eth0
       version: 05
       serial: 78:2b:cb:e6:7a:ca
       size: 10Mbit/s
       capacity: 100Mbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half firmware=rtl_nic/rtl8105e-1.fw latency=0 link=no multicast=yes port=MII speed=10Mbit/s
       resources: irq:46 ioport:d000(size=256) memory:f3204000-f3204fff memory:f3200000-f3203fff
  *-network UNCLAIMED
       description: Network controller
       product: Centrino Wireless-N 1030
       vendor: Intel Corporation
       physical id: 0
       bus info: pci@0000:09:00.0
       version: 34
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress cap_list
       configuration: latency=0
       resources: memory:f7a00000-f7a01fff
  *-network
       description: Ethernet interface
       physical id: 2
       logical name: eth2
       serial: 00:1f:1f:96:af:41
       capabilities: ethernet physical
       configuration: broadcast=yes driver=cdc_ether driverversion=22-Aug-2005 firmware=CDC Ethernet Device ip=192.168.2.3 link=yes multicast=yes

Now where is the problem and How should I solve it?