Windows XP - Your computer stops responding when you restart to complete the installation of Windows XP Service Pack 2 or Windows XP Tablet PC Edition
If you have had an issue upon restart after a Windows XP or Tablet PC 2005 Service Pack 2 installation the problem may be with your BIOS version or the Processor that you are using. This Microsoft article may help:
http://support.microsoft.com/default.aspx?scid=kb;en-us;885626&Product=winxp