Wi-fi networking problem

Hi, After some hours of trying to get things to work I think I must now 'ask the experts' as my amateur attempts are going nowhere! I am in Australia so my modem is a Telstra wireless 2-wire Gateway which also acts as a router.
I purchased a new computer with Windows7 OS and am attempting to add it to my home network.
I have a Netgear N300 Wireless USB Adapter which I have installed onto the new computer and it recognises the Telstra Bigpond Gateway but will not connect to it or to the home network which has 2 other computers already connected.

Any ideas or advice would be greatly appreciated.

Regards,
Judy

Are these various types of OS or just Windows 7 computers

Windows 7 has a Home Group option http://www.neowin.net/news/main/09/01/13/windows-7-homegroup-overview This doesn't work with XP or Vista.

If its various OS you can set it to a work group.

Make sure you have the same work group name or they cannot see each other

Hi,
Thanks for your reply.
2 computers have Windows7 OS and one has XP. When you say the same workgroup name, do you mean the name of the home network? I have done that and tried 'push to connect' option - that didn't work then I followed the instructions to connect manually, my Gateway/Router name appears but when I select it and click Connect I just get a message saying 'not connected - no connections available'. It's probably something simple but for some reason I can't find the solution.
Judy

http://windows.microsoft.com/en-US/windows7/Join-or-create-a-workgroup I was thinking of this but its seems as though your trying to get your computer onto your network

I have Windows 7 computer.

Go to Start>>Control Panels> Netowrk and Internet >> Neetwork and Sharing Center

Under the Change your Networking setting

Click Connect to a network

Find your router in the dialog box Click your router name and if you have it setup using a password enter the appropriate key if not it will connect to it.

This is a tutorial with pictures
http://www.7tutorials.com/how-connect-wireless-networks
http://windows.microsoft.com/en-US/windows7/set-up-a-wireless-router

See if that helps you

First we need to know what type of problem you are experiencing. Are you able to connect to the router at all? Do you have internet access? Do you get an error stating "Limited connectivity" or "no internet access"? When you click "connect" to connect to the wireless router are you Entering the Password provided with your router?