Wireless Network Problems

[kgzak]

Our team had the laptop stolen out of our build room a while ago but one of our teachers was upgrading to a new laptop so we got to use their old one. It runs windows Vista and I am having issues connecting it to my wireless network. My Macbook connect great, my windows xp laptop connects fine, my Brothers Macbook connects fine, My mom's Windows 7 laptop connects fine and my dad's Vista laptop connects fine. When I try to connect this it sees the network I click connect and it says Obtaining IP Address then Identifying Network. After sitting and Identifying network for a little while it says Unidentifiable Network and Limited Access. Anyone know what's going on and why it won't connect. based on the preferred networks it's been online before but why isn't it working on my router?

Thanks,
Kris