Dell Desktop Can't Wireless

After 2 days spending hours on the phone/online with DELL tech.
I have gave up all my hope from them! :

So here is my last chance!

Hi

I'm setting up a wireless network for my Dell Inspiron 530s Desktop. I am using a 802.11g network adapter with Linksys Router WRT150N runs on Vista .

The driver has been updated to the newest one directed by DELL.
I ve called Linksys, they made sure the router works perfectly . My other 2 pc is connecting to the same router work just fine.

what's the problem then?

For unknowing reason, I just can't get wirelessly online !

Any help would be appreciated.

Thanks!

Can the DELL even see the wireless network to connect to?

Regards

Fred

yes, i can see all wireless networks in my areas...
also my own['s....