Windows 7: Default gateway is not available

I am using an Acer Aspire One netbook running Windows 7 Starter--for now; I plan to uprade--and an Atheros AR5B93 wireless card. Unfortunately, I am frequently unable to to access the internet. When Windows executes an automated repair, it reports that the "default gateway is not available." It resets the network card, but that only fixes the problem for a very short time, sometimes only a matter of seconds. How can I remedy this problem on a more permanent basis? Thanks in advance.

Set a static ip for the network adapter.

Unfortunately, that does not help. I am still unable to stay connected. The only difference is that Windows now reports that the problem is that DHCP is not enabled.

What settings did you use?

The ones listed for the wireless adapter under ipconfig /all.

That's problem.

ip address = same as router ip config page shown in the manual. (typically 192.168.0.1 or 192.168.1.1) Change last part only for ip address.

subnet mask = 255.255.255.0

default gateway = same as router ip config page in the manual

preferred dns server = same as router ip config in the manual

Here is a theoretical example:

ip address = 192.168.0.75
subnet mask = 255.255.255.0
default gateway = 192.168.0.1
Preferred dns server = 192.168.0.1

I would try and let your system auto detect your LAN setting first. It usually does a good job and you needn't do anything.

But if you need to go static ip, let see your what you have from ipconfig /all?

Well, there is an issue there. The network I'm connecting to is a campus wireless network, not a personal one.

Have you tried having it set to autodetect?

What is your ipconfig /all?

If you are wanting just to plug in your default gateway, then that depends on your network, usually and theoretically it's the first node (IP) in your immediate network.