Windows update is not happening

Hi,

This with regards to Windows update in windows XP . I am have almost 250
system with windows XP service pack 2, All my systems are connected to domain
controller in windows 2003 server. while manually doing or through SUS
windows
update in all the desktops i get an error message.if i remove my desktop
from domain controller then update happen with out any problem and In my
server CA is also installed.
i GET FOLLOWING ERROR

[Error number: 0x80096005]
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Microsoft Online Assisted Support (no-cost for Windows Update issues)

I need help for the above mentioned problem .

Regards

Alex