when i installed ubuntu 11.10 then wi-fi was working nicely.but now it is not catching wi-fi network and while i click on network button it shows that " wireless is disabled by hardware switch ". i already have installed broadcom driver. please help ????

You are probably missing the firmware you can find it here: http://www.omattos.com/node/6
There are 2 folders inside the file extract them and put the folders in /lib/firmware

Regards

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while extracting to /lib/firmware , it is showing an error--------

Extraction not performed

You don't have the right permissions to extract archives in the folder "file:///lib/firmware"

You have to be root to write files into /lib/firmware , that is why it says permission denied.

how do i become root ??? (please tell the process. i am very new to ubuntu)

You have practically two options, either run the graphical (un)archiving program through gksudo, or a command line program by using (non-graphical) sudo. As an example of the latter one,
The first command (sudo su) gives you a shell with root privileges, after asking for your (user) password. After that you change the working directory to the place you want to extract the contents to, then extract the archive. Then you exit the root privileged shell (or simply close the terminal emulator). Remember to alter the path and filename to suit your situation. If you have a zip compressed archive, for example, then use unzip instead of tar (unzip should require no options in that case). Another way is to simply cd to the desired directory and run "sudo tar ...", without actually "becoming root".

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@b0uncer.......i tried this also, i changed directory to/lib/firmware and then tried to extract files to firmware, but it still showing that " you don't have permission to extract files to /lib/firmware "

sir, i changed directory to "root@ubuntu:" and tried to extract, but it is still showing the same error...

When you have the terminal open, do you see at the end of the line after your computer name the symbol $ or the symbol # ?

$ means regular user logged
# means root looged

If you see the $ type sudo su then press enter key and then type the password, the password isn't visible as you type make sure you type it correctly and then press enter key.
Example:
regular user prompt(logged as regular user):
root prompt(logged as root):
I hope this clarify

Regards

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thanks sir...i appreciate your help but....

pawan@ubuntu:~$ sudo su
[sudo] password for pawan:
root@ubuntu:/home/pawan#

after this i didn't closed terminal....and tried to extract both folders at /lib/firmware.......but it is still showing that "Extraction not performed

You don't have the right permissions to extract archives in the folder "file:///lib/firmware"

Ok there is something weird about that file and you will have to rename it so:
That underscore in the original file doesn't let you untar.

Extract it in the current directory and then copy to /lib/firmware so:
Regards

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thanks a lot buddy...it worked...thank you very much..

I'm glad to help !

Regards