Renew IP address

Have you tried unplugging and restarting the router or modem your computer is connected to?

just adding to the suggestions

another tool to try
http://www.snapfiles.com/get/winsockxpfix.html

Statically assigned IP address?

More info needed!!! Provide some background on your system setup. Did anything recently change on your setup right before the problem started, etc.

If this is a wireless card, ipconfig /renew will not work if the "media is disconnected" - i.e. you are not already connected to the network.

If so - delete your wireless profile from Preferred Networks (R-click your Wireless Connection in Network Connections, select View Available Wireless Networks, click on Advanced Settings) click Apply, then click the Add button - and put your settings back in - click OK.

We use a DHCP server in our office. Each IP, assigned by the MAC address of each ethernet card which is disable to change the IP. Maybe your problem same with me?

Sorry to all who posted answers. Thank you for your responses.  I tried to recall my answer acceptance but couldn't. You do need more informaiton.

Here is the background to the problem - I have wireless internet service to my home and an Ethernet router supplied by my wireless provider.  I set up a wired ethernet connection to my main Dell computer from the router.  Had one Dell desktop computer which I wanted to make wireless (was never hooked up to this router or wireless service) and bought a new HP laptor with wireless capability. Attached a Linksys WAP-54G Wireless G Access Point to the router, used the Linksys software to boot the wireless connection and the laptop wireless connection worked immediately with good reception throughout my house.  

So, I bought a Linksys Compact Wireless G USB Network Adapter with speedbooster for the other desktop Dell. Unfortunately, I thought I needed another access point to run the Laptop and desktop at the same time - and a newcomer at BestBuy told me the same. So I bought a second Linksys Access Point (Same type), installed it.  Installed the USB Wireless Adapter and the Linksys setup software and the then the Desktop worked perfectly (with the newer -second installed -  access point).

THAT is when the wireless connection to laptop stopped working.  I have no problem with the laptop if it is hard wired to the router.  When not hard wired to the router - the laptop ackowledged that both of the the wireless networks were available.  However, it would never connect to eithr wireless point.  When I tried to get XP to renew the IP address it basically just sat there and cycled.  The IP address was never renewed so I assumed that is why the wireless connection never linked up, even though the laptop acknowledged the wireless networks were available.

I later found out that the fellow at Bestbuy had given me bad information and I didn't need two access points for just two computers. So I have removed the original access point which was first used to connect the laptop.  Again, the laptop acknowleges the remaining wireless network is available.  It just won't connect, whether I am adjacent to the access point or in another room.  The desktop continues to connect connects perfectly without a problem.

I did try to repair it by diconnecting the router - left it off line for 8 hours and reconnected.  With the same results.  So, I am reaching our for yor help. At this point I'm completely lost.

Hope that helps - thanks again for your consideration in trying to help me.  

Since I had already tried all the options posted prior to posting my question except that by sirbounty I will try that solution.

Thanks. Will report back as to results.