Hello,
I just moved and I set up a desktop computer. It is a HP Pavilion a1510n. I had the internet connected the other day and it works fine, but I do need to set up a wireless NETWORK, that my laptop could connect to. The desktop runs on Windows XP and my laptop runs on Windows Vista.

I tried hooking up the router to the modem and computer and rebooting, but for some reason, my desktop does not recognize the router and thinks the ethernet cable is unplugged. Because of this, I cannot get internet on either computer when the router is plugged in.

Can someone please help me!! I've been trying to work on this for days!!

Thanks a lot!Hello, this is a quick reply. Just stick around and the be some other use or so come on in just a second.
First of all, welcome to computer help. This is absolutely the best place you can go for free help. And even for not free help, but it's free anyway.
Without the details I just have to give WILD guesses. I will assume you have a DSL modem that is just a plain modem without a router else into it. And I'll assume that you opt for wireless router and this is the first time you've tried it with a modem. If not, you'll need to give us the full details of why it worked before or how it worked before and then it will try to FIGURE out what it is you changed.
But in case it is a simple DSL modem and you're just not a router to it here's the problem. You might be using a cheap Motorola modem provided by your local telephone company. They do work, but not very well. In order to give you a quick answer I am just going to assume that you have a recent model of a D Link router. Even if that is not the case when I'm going to describe might apply to your situation.
That particular modem that I mentioned just likes to use an IP address that should be used for other things, like routers. So what's needed to is the disconnect the modem and the router, reset the router, restart your computer and talk to your router. You do that by typing in the IP address of the router in your favorite browser.
Once you get up into the router unit needed check and see what IP address it has. We are talking about the local IP address that uses for communications between your computer and the router. If this is the same IP address as the modem, then it has to be changed.
Example:
192.168.0.1         modem address, can not change
192.168.0.1        rooter address, must change

192.168.0.50       new address for router.
The above example is typical, but may not work in your case. Even if it is right, it can be awkward, because after you change the IP address for the router you can no longer access the router. So you have to restart your browser with the correct address before you can talk to the router again. If all GOES well, at this point you could plug the modem back into the router and you'll probably have to reset your computer again and allow the modem and router to talk to each other for a bit. Then you can go into the router, using the new address, and see if you can get the router to find the modem and tell you that it has a CONNECTION to the Internet. If you get that far and the router says there is an Internet connection you probably have it fixed.
Please bear in mind this was a quick reply to save you time. If your details are different than we have to start over. I'm going to have to take some time off for a bit, but somebody else will jump in here and help you if you have more problems.
Please excuse types. Just a quick answer.It should all be plug and play (the operating systems are irrelevant). Plug the modem into the router and an ethernet connection from the router to the desktop's NIC. If it doesn't work right away just reboot the router and if it still doesn't work go to Control Panel - Network Settings and try to "repair" the connection. What does Network Settings show as the available connections(s)?