You can use your laptop as a hotspot using ICS - Internet Connection Sharing. (Windows 7 Starter might not have this).
Read this.. How to enable ICS
http://support.microsoft.com/kb/306126
Then this how to create a ad-hoc connection on the wifi adapter..
http://www.microsoft.com/windowsxp/u...p/adhoc.mspx#2
Super basic instructions:
basically go into your adapter settings.. right click the LAN one, properties, advanced, internet sharing, share it with your wifi
I would then disable it renable it let it reconnect
Now right click your wireless connection (wifi adapter) , properties, wireless networks, click "add", make a new ad hoc connection.