Dell Vostro v130 - wireless problem

Hi everybody,

I bought Dell Vostro v130 half a year ago. Everything was OK, but few days ago, wifi stopped working.

After loading of Win 7, many networks was found, but computer wasn't able to connect, so I tried to run Diagnostic of network, which restarted my network adapter, but after it, computer wasn't able to work with wireless.

In Ubuntu, which is installed in the same laptop, there was written, that no wireless networks are available.

Today, a technician from Dell changed wifi, but unfortunatelly, i couldn't check it, because I was in hurry. And in the evening, I saw, that it is still not working. So now I have new wifi in my laptop, but it is not working, so I guess, that it could be sw problem. Can anybody advise me, what can be wrong?

Thanks

Michus