Wubi installed ubuntu 10.04 can't use wireless network on laptop

Ubuntu 10.04.03 LTS was installed recently using Wubi. Wireless works well in WinXP on same laptop. So hardware has no problem. But no wireless network can be found in Ubuntu by network-manager or Wicd. Manually inputing wireless ESSID and password in network-manager didn't help. I have tried all commands related to wireless network I can find. The output are as below. It seems wireless card was disabled. But I couldn't find way to enable it. Any comments are welcome!

$ rfkill list
(no output)

$ sudo lshw -C network
  *-network DISABLED
       description: Wireless interface
       product: RT3090 Wireless 802.11n 1T/1R PCIe
       vendor: RaLink
       physical id: 0
       bus info: pci@0000:02:00.0
       logical name: wlan0
       version: 00
       width: 32 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=rt3090 latency=0 multicast=yes wireless=RT2860 Wireless
       resources: irq:17 memory:fbff0000-fbffffff
  *-network
       description: Ethernet interface
       product: Atheros AR8132 / L1c Gigabit Ethernet Adapter
       vendor: Atheros Communications
       physical id: 0
       bus info: pci@0000:01:00.0
       logical name: eth0
       version: c0
       serial: 90:e6:ba:81:3d:a9
       capacity: 100MB/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress vpd bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=atl1c driverversion=1.0.0.1-NAPI firmware=N/A latency=0 link=no multicast=yes port=twisted pair
       resources: irq:28 memory:f7fc0000-f7ffffff ioport:ec00(size=128)

-- Note that wireless card is DISABLED and driver is rt3090.

$ sudo lsmod | grep rt3090
rt3090sta 674216 0

$ sudo ifconfig wlan0 up
SIOCSIFFLAGS: Operation not permitted

$ sudo rfkill unblock 0
(no output)

$ iwconfig
lo no wireless extensions.

eth0 no wireless extensions.

wlan0 RT2860 Wireless ESSID:"" Nickname:"RT2860STA"
          Mode:Auto Frequency=2.412 GHz Access Point: Not-Associated
          Bit Rate:1 Mb/s
          RTS thr:off Fragment thr:off
          Link Quality=10/100 Signal level:0 dBm Noise level:-87 dBm
          Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
          Tx excessive retries:0 Invalid misc:0 Missed beacon:0

$ iwlist scanning
lo Interface doesn't support scanning.

eth0 Interface doesn't support scanning.

wlan0 No scan results

$ iwpriv
lo no private ioctls.

eth0 no private ioctls.

wlan0 Available private ioctls :
          set (8BE2) : set 1024 char & get 0
          connStatus (0004) : set 1024 char & get 2047 char
          driverVer (0005) : set 1024 char & get 2047 char
          bainfo (0006) : set 1024 char & get 2047 char
          descinfo (0007) : set 1024 char & get 2047 char
          radio_off (000A) : set 1024 char & get 2047 char
          radio_on (000B) : set 1024 char & get 2047 char
          show (0014) : set 1024 char & get 2047 char
          adhocEntry (0015) : set 1024 char & get 2047 char
          bbp (8BE3) : set 2047 char & get 2047 char
          mac (8BE5) : set 1024 char & get 1024 char
          rf (8BF3) : set 2047 char & get 2047 char
          e2p (8BE7) : set 1024 char & get 1024 char
          stat (8BE9) : set 0 & get 2047 char
          get_site_survey (8BED) : set 0 & get 1024 char

$ iwpriv wlan0 --all
wlan0 Available read-only private ioctl :
wlan0 stat:

Tx success = 0
Tx success without retry = 0
Tx success after retry = 0
Tx fail to Rcv ACK after retry = 0
RTS Success Rcv CTS = 0
RTS Fail Rcv CTS = 0
Rx success = 0
Rx with CRC = 0
Rx drop due to out of resource = 0
Rx duplicate frame = 0
False CCA (one second) = 0
RSSI-A = 0
RSSI-B (if available) = 0
RSSI-C (if available) = 0

WpaSupplicantUP = 1

wlan0 get_site_survey:
Ch SSID BSSID Security Siganl(%)W-Mode NT

$ iwspy
lo Interface doesn't support wireless statistic collection

eth0 Interface doesn't support wireless statistic collection

wlan0 Interface doesn't support wireless statistic collection

$ ifconfig
eth0 Link encap:Ethernet HWaddr 90:e6:xx:xx:xx:xx
          inet addr:192.168.1.101 Bcast:192.168.1.255 Mask:255.255.255.0
          inet6 addr: fe80::92e6:baff:fe81:3da9/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
          RX packets:3870 errors:0 dropped:0 overruns:0 frame:0
          TX packets:3155 errors:0 dropped:0 overruns:0 carrier:3
          collisions:0 txqueuelen:1000
          RX bytes:4339623 (4.3 MB) TX bytes:387764 (387.7 KB)
          Interrupt:28

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:8 errors:0 dropped:0 overruns:0 frame:0
          TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:480 (480.0 B) TX bytes:480 (480.0 B)