Wireless laptop will not connect

Hard drive crash so I had to re-install Windows Xp pro after doing so i wanted to see if the sp2 patch would work on my system since I had no data to recover or to loose I figuere it would be ok. After doing so I could not get my internet to work. So I uninstalled sp2 off my system and now I can get my desktop to go on the internet by way of Broadban. But now my wireless laptop will not longer connect. Everytime I run the network wizard it will not complete and it tells me that I need to put my desktop on the network. What does this mean and why can i connect my wireless laptop to my network. Network on laptop is active and all my bars are green showing connectivity with router. Please Help !!!!