My situation is:

I have (2) Desktop PC at home - which is already wired (file sharing and internet OK)
both connected to Linksys WRT54G (router/ap/switch)

I have a DSL connection - which is connected to the Router (via DSL modem)

And I have (1) Centrino Laptop with built-in wireless-G access card.

My concern is how can I bridge my Laptop to my 2 wired Desktop PC (using My Network Place, to share files) - My Laptop can access the internet via wireless router

Or can I say "how to bridge my wired PC to wireless laptop"

Do I need to buy another USB wireless card for my Desktop PC?

Please Help!!!

Thanks very much.

it sounds like you have three computers all on the same network; therefore, you don't need to do any bridging at all just make sure proper firewall permissions are set so your laptop can "talk" with your PCs to share files.