How to change/update wirelss driver?

How to change/update wirelss driver?

Just buy laptop "hp 2000" install ubuntu 10.4. But my wireless network is not working.
what to do ?
Need quick help.
iwconfig output:
tejastank@tejastank-laptop:~$ iwconfig
lo        no wireless extensions.

eth0      no wireless extensions.

pan0      no wireless extensions.
ifconfig wlan0 up output:
tejastank@tejastank-laptop:~$  ifconfig wlan0 up
wlan0: ERROR while getting interface flags: No such device
lspci -v output:
tejastank@tejastank-laptop:~$ lspci -v
00:00.0 Host bridge: Intel Corporation Device 0104 (rev 09)
    Subsystem: Hewlett-Packard Company Device 1858
    Flags: bus master, fast devsel, latency 0
    Capabilities: <access denied>

00:02.0 VGA compatible controller: Intel Corporation Sandy Bridge Integrated Graphics Controller (rev 09)
    Subsystem: Hewlett-Packard Company Device 1858
    Flags: bus master, fast devsel, latency 0, IRQ 7
    Memory at 52000000 (64-bit, non-prefetchable) [size=4M]
    Memory at 40000000 (64-bit, prefetchable) [size=256M]
    I/O ports at 4000 [size=64]
    Capabilities: <access denied>

00:16.0 Communication controller: Intel Corporation Device 1e3a (rev 04)
    Subsystem: Hewlett-Packard Company Device 1