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Obtaining an address automatically: If you are not receiving your IP address via DHCP, here is how to set your computer to use DHCP: Right click the wireless icon on your system tray, click "Open Network and Sharing Center".
I currently do Information Technology work for a living, and professional sound as a side job. Due to a recent demand for help with home networks, I have decided to write this instructable on how to troubleshoot your home network.
To set your ip addressing to automatic, see step 6.
If your network is DHCP Enabled, then look at your IPv4 Address, Subnet Mask and Default Gateway.
Now we need to check and make sure you are on the correct subnet.
I will not be explaining subnetting in this instructable, only the basics used in home networking.
Wi Fi A networks are 5 GHz, Wi Fi B networks are 2.4 GHz, Wi Fi G networks are 2.4 GHz, and Wi Fi N uses both 2.4 and 5 GHz bands.
What this means is that if you have a 2.4 GHz wireless NIC (which is the most common), it will not work on an A network.
If so, it probably proves that there are not any hardware issues present on your computer (unless you are trying to connect to a 5GHz network with a 2.4GHz network adapter... Are other computers able to connect to this network?
If so, then there might be a problem in your settings on the problem computer. It could be a lot of things, but interference and DNS problems are the most common in home networks.
If you are using Vista, it is very similar to Windows 7, so follow those instructions.
If you are using Windows 8, you're on your own.(your computer, router, modem, switches, etc).
If your router is an A router, then you need to get a wireless NIC that supports 2.4 and 5 GHz networks.