[NTSysADM] Computer Group Policy not applied to XP

[Steve Norton]

Computer Group Policy from 2008 R2 SP1 fails when applied to XP SP3 using 
Global security groups. Windows 7 workstations in the same security group 
process the computer policy fine. If I add the XP workstations manually to 
Security Filtering they work fine. What am I missing? 
  
Thanks. 
  
Steve