this guide helps you to share your dsl/cable internet connection without a need of a wireless router using only a windows vista laptop that has a wifi adhoc capabilities
1st: go to control panel and hit on networking. click on manage connections and setup a new wifi adhoc network and for example we'll name it "wireless"
2nd: after your name the network profile its for you to have it secure or not.
3rd:save your network
4th: go to task scheduler and create a task name it as 'automatic adhoc'
5th: the program you need to run is called netsh.exe(you can find this at c:/windows/system32/)and add this following
command "wlan connect name=profilename" without the quotes ok. change the profilename into wireless
6th: do not start in windows startup but choose to start it in windows logon
7th: now you're good to go. everytime you turn on your laptop you can share it in you neighborhood