I was worried too. But I know the solution!
I have the same wireless built in card (Intel PRO/Wireless 2200BG) and I have windows 7 Ultimate x86.
The good news are I was accessing this forum initially through cable-LAN until I went on Intel's download support webpage and downloaded the Windows Vista drivers: Confirm Download
I then used the Device Manager under Computer Management to manually update the "unknown network adapter" drivers by pointing it to the vista w32 folder I had just downloaded from the above webpage.... and voilá! I've just disconnected the LAN-cable and I'm accessing the internet wirelessly!
Regards and Godspeed,