Vista - Local Access Only

I've been searching the internet for about 2 days already and I've found a bunch of topics on this and tried the solutions but none seemed to work!

I recently had a rogue on my Vista and now the internet won't work. It says I'm connected, but locally only. When I go to the Network center in the Control Panel it says I'm connected to the router when an excellent signal strength but my router isn't connected to the internet. I know it's not a firmware or the router now being compatible with Vista because this laptop I'm typing it on is a Vista and it connects fine with the router. I've tried resetting the router and that didn't work. I've wired and wireless and both come up with the same local access only. I've tried the whole command "netsh" and winsock reset things. I've tried disabling the IPv6 and that didn't work. Nothing seems to be working.

I have two computers that have this problem (an XP desktop and a Vista laptop) and it would AWESOME to have it fixed.

** I don't have the format disks for the computers. When I bought the computers it didn't come with one and now the store I bought them from is out of business (nationally) and I'm not sure where to get one.

** I read something about locating the DHCP thing and about how there are rogue servers and stuff. I didn't totally understand it, but I had a rogue on both computers right before it stopped connecting to the internet so I'm wondering about that. If someone could educate me about this that could be awesome.