Start/All Programs/Connect to/Wireless Connection
Under the Support Tab click on Details and make a note of these numbers carefully and what they refer to. You don't need the Physical Address at the top or the WNS Server at the bottom.
Go back to the General Tab to the left of Support and press Properties. Double click on Internet Protocal (TCP/IP) and enter the numbers above by manaully configuring the two options.i.e. change them both to 'Use the following........'
If this doesn't make sense post back.It's a lot easier than I have probably made it out to be. You can always simply change the settings back if it doesn't work but I think it will as you wont have to search for the IP details each time.