Multiple networks in Windows Vista?

When I log on my network connection shows "multiple Net works" that is Network 3 and Network 4 and shows that both are connected. How do I get rid of one of them, or, is it better to have both working at the same time? Using windows vista Home Premium.

Thanks

 

Start/Control Panel/Network and Sharing Center/Manage Netowork Connections

 

Thanks AKAJohnDoe, when I get to manage network connections how do I know which to disable or disconnect? I don' seem to see a place to delete one or the other. What am I missing?

 

I was able to merge Network 3 and Network 4 into Network 3 and it appears to be working Ok for now.

 

You might consider renaming it. I find that it is easier to keep them straight if they describe what they are. Home Wireless for example. Simple and descriptive.