Can Access Router But Not Internet

My laptop will connect to my wireless router with a strong signal but I am unable to use the internet. This problem started when I changed my hard drive. I have reinstalled all the corect drivers and XP SP2. If I plug my computer into the router, then I can pick up the internet. Boggles me. Help!!!! Any possitive input would be appreciated.

Turn off your firewall and try. If that doesn't work, try recycling your router and modem, turn of the computer, unplug both the router and modem, wait a few minutes plug in the modem, wait a few minutes, plug in the router, wait a few minutes and start the computer. Run the wireless connection wizard if no connection

How To Release and/or Renew IP Addresses on Windows XP | 2000 | NT
From Bradley Mitchell,
Your Guide to Wireless / Networking.
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Follow these steps to quickly release and/or renew the Internet Protocol (IP) address of a computer running Windows XP, Windows 2000, or Windows NT.
Difficulty: Easy
Time Required: seconds
Here's How:

1. Click the Start menu button on the Windows taskbar.

2. Click Run... on this menu.

3. If the computer is holding a current IP address, type 'cmd' (without the quotes) in the text box that appears. A command prompt window appears on the screen.

4. Type 'ipconfig' (without the quotes) to view the status of the computer's IP address(es).

5. If the computer is holding a current IP address, type 'ipconfig /release' to let go of the address.

6. Type 'ipconfig /renew' to obtain a new IP address (whether or not the computer is holding a current address).

Tips:

1. If it is not necessary to view the current IP addresses on a computer, simply type 'ipconfig /release' or 'ipconfig /renew' (without the quotes) in the text box that appears in Step 3.

2. To bring a computer back onto the network after moving it to a different location, or experiencing an unexpected outage, first release, then renew the IP address. Computers on DHCP networks often (but not always) re-establish network connectivity automatically.

What You Need:

* WinXP, Win2000, or WinNT
* IP network connectivity

http://compnetworking.about.com/cs [...] ddrwxp.htm

If none of the above fixes the problem, reset set the router to the mfg's default settings, should be a button on the back, possibly recessed, this will also reset the router log on and password to the mfg's default. Then set up the network again, generally you get a CD with the router for this.

Have you tried connecting the modem directly to the computer?

Sounds like bad DNS entries, but I don't get where you when you would have entered them. Go to your network connection properties (Start->Control Panel->Network Connections->Right click on your connection->Properties). In the properties dialog, on the General tab, click on Internet Protocol TCP/IP, then click the properties button below. Ensure that both options are set to Obtain automatically.

what is the isp. i tried to set up AOL broadband for someone and you could only have 1 person connected to the internet which was the router and no actuall clients.