Getting frustrated

Hello,
Ok, here is the deal. I got this Dell PC some time ago and never really did anything with it until this week I wanted to try connecting it to the internet. I already have a Belkin G router in my house that works great with no problems with a 2002 Dell PC that has a Belkin G card that I installed. A friend gave me a D-Link wirerless USB Adapter to try. I downloaded the drivers for it on a jump drive and installed it into the unused Dell PC connected the D-Link Adapter and nothing happened. It couldn't even find the Belkin router. Next I uninstalled the drivers for the D-Link, went out and purchased a Netgear G card " the store didnt have the belkin g cards in stock". I followed all the directions to the letter and I'm still unable to connect to the internet. The Netgear G card found my wireless network with no problem; but it never connects to the internet. My wireless icon in the lower right corner says that its "aquiring address". I went to Network Connections looked under Details tab: the IP Adress = 0.0.0.0 the Subnet Mask = 0.0.0.0. I went to the Command Prompt typed " ipconfig/all " it says "media disconnected" and the same when I typed " ipconfig/renew ".
HHHHHHHHHEEEEEELLLLLLLLLLPPPPPPPP!!!!!!!!!!!!!!