For those with the ATI Radeon HD 2400 I believe the solution is to install the latest driver V9.10 dated 10/22/2009 before re applying the WIndows XP update KB969947.Available from [URL]  I am afraid I am not on the site with the problem today, so if anyone manages to try this I'd appreciate if they can confirm this as a valid solution. Hope this helpsWilliam  
It seems that one of the recent MS Update released in the November batch has caused some DELL PCs to subsequently hang. The updates are applied OK but after the next reboot the PC hangs / freezes about a minute after you logon after a further few minutes even any mouse movement ceases. So far it has been suggested that it might be related to the Windows XP update KB969947 but I haven't verified it's that particular one. The current workaround solution is to Boot into safe mode and use the system restore to revert to a state before the update was installed, then turn Automatic updates OFF. It has also been suggested it may effect those Dell PCs with the ATI Radeon HD 2400. Is Dell aware of the problem ? Is there a better solution so Windows Updates can be turned back ON ?    
November Windows Update causes some Dell PCs to subsequently hang / freeze