network did not assign network address to the computer

remove the wireless profiles from the PC and see if you can connect - also post an xirrus screen shot

do you know what type of security is being used at home ?

try logging into the router and remove the wireless security and then try and connect to the wireless network - if that works
go back and reset the wireless password on the router - often that can help

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How to remove Wireless Profiles - for XP
http://mgmcc.forumotion.net/networking-tutorials-f17/removing-an-existing-wireless-profile-t109.htm
- XP
http://www.tp-link.com/support/showfaq.asp?id=186
- delete the preferred networks
start> control panel> network connections> right click on the wireless connection> listed wireless networks tab in the preferred network list click on each one and - remove button

you will then have to enter the wireless security key for any networks you connect to - so make sure you know the correct password , and not using an incorrect password at all

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Run Xirrus Wi-Fi Inspector
Download and install
If you cannot access the internet with this PC, then you will need to copy the program across to the faulty PC

http://www.xirrus.com/Products/Wi-Fi-Inspector.aspx
Direct link to the program is here http://wpc.475a.edgecastcdn.net/00475A/XirrusWiFiInspectorSetup.1.2.0.exe

{If the above link does not work heres another link http://www.pcworld.com/downloads/file_download/fid,77196-order,4/download.html}

Then run and install the program - on a wireless enabled PC/Laptop
if you get an error - You need NET Framework installed for the WiFi Inspector to function.

Run the program

A user guide is available here http://www.xirrus.com/Products/Wi-Fi-Inspector/xirruswifiinspectorguide1-2-0.aspx

post a screen shot of the program running - if there are a lot of networks showing can you click on "networks" top lefthand area - so we can see all the network information, and also post which network "Adapter Name" (1st column) is yours on the list

To post a screen shot of the active window, hold the Alt key and press the PrtScn key. Open the Windows PAINT application and Paste the screen shot. You can then use PAINT to trim to suit, and save it as a JPG format file.
To upload it to the forum, open the full reply window and use the Manage Attachments button to upload it here.
Full details are here http://library.techguy.org/wiki/TSG_Posting_a_Screenshot

Note:
For a reliable (or robust as the Xirrus user guide says) wireless connection you need a signal of about -70 dBm or better.

If you are using the Mac OS then use http://www.istumbler.net/
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the * do not always represent the exact number of characters - lets see the xirrus screen shot

are you 100% sure you have the correct key and NOT mistyping or using/not using a capital letter correctly

 

Here is TSG Posting a Screenshot and etaf posted earlier about the Xirrus Inspector.