Windows Xp Home edition - Problems with wireless

Hi

I am running a windows server 2003 network and have several access points around the college, They are protected by WPA-PSK, and do not have a problem connecting most devices wirelessly. However i have 2 pc's running windows xp "Home Edition" and they will not connect to the WAP. All i get is the trying to Authenticate (renew IP), then it disables the wireless adaptor, re-enables itself and tries to go through the process again, on an endless loop.

PLEASE can anyone help its driving me nuts!!!

Thanks in advance :-)