Ok, that's definitely not "everything". By WAP, Do you mean WPA or WEP? If you mean WPA, is it WPA or WPA2, personal or enterprise? Is the encryption TKIP or AES?
(on win7) Right click the wireless icon in the taskbar, select open network and sharing center. click manage wireless networks on the left side. Right click your wireless profile and select properties. select the security tab. Make sure all those settings match you dekstop's. check that the SSID matches in the connection tab as well.