Hi John,
To some extent it will also depend how the laptop has been configured and if it is using Windows own wireless controller software or that supplied with the laptop.
If you look on the right hand side of the thin task bar at the bottom of the screen (the task bar may run down one side of the screen if that is where it has been positioned) you may see a small symbol that looks like a bar graph with increasing sized bars. Or a small symbol that looks like a monitor with a satellite dish or aerial on it.
If you have either of these logos, or anything else that looks similar and they have a cross through them (Or possibly the bar symbol is red) then this indicates that the wireless is enabled but that there is no connectivity.
If you aren't using wi-fi at home and you can face the ordeal of a trip to Mc'Donalds (or somehere else that offers free wi-fi)then go there with your laptop and observe the symbols.
The symbol should change to show that wi-fi signals are available in the vacinity. Click on the symbol and it should open a screen that shows all the available access points that have been detected. Select the one you want to connect to by double clicking on it. If it says "secure network" then this means it is password protected and you need the password key from the network provider.For free wi-fi you need an unsecure or open connection.
If you don't have the symbols on your task bar as described above then try the following :
Left click on the START button bottom left.
Left click on the NETWORK option in the list on the right.
(If there isn't an option Network) then select Control Panel instead, then Network & Internet, then Network & Sharing centre).
Left click where it says Network & Sharing Centre
Left click to the left where it says Connect to a Network
Select Wireless in the dropdown box where it says Show
A list of available wi-fi networks should then appear and you can click on the one you want to connect to.
After doing all of this, open the internet browser and go to a page like www.google.co.uk.
If you are in Mc'Donalds then instead of google you will get a Mc'Donalds wi-fi page where I think you have to register your email address to get the free wi-fi access. Once you have done this you can surf as normal.
Have to say that I am no expert and the above may not be 100% right and there may be a quicker way. But you can't do any damage by trying, so have a go and come back to us if you hit any problems.
Anyone else reading with more knowledge, then feel free to chip in !!