I'm still troubleshooting, but I wanted to see if others are seeing similar issues.

On 9/11/09, I installed DC, and started deploying the agents around 10:30 am - 11 am.  Now, I am seeing two disturbing issues that popped up on those clients minutes after deploying the agents.  It is tough to say whether these individual issues are related to one-another, but I can say definitively that they both began after deploying the agents (down to the minute as a matter of fact).

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Symptom 1:  A large number of warnings in the Windows XP event logs from the source "WinMgmt" (Windows 2008 servers have a source of "WMI") with varying details, but they look similar to this  -

"A provider, HiPerfCooker_v1, has been registered in the WMI namespace, Root\WMI, to use the LocalSystem account.  This account is privileged and the provider may cause a security violation if it does not correctly impersonate user requests."

"A provider, MS_Power_Management_Event_Provider, has been registered in the Windows Management Instrumentation namespace Root\CIMV2 to use the LocalSystem account. This account is privileged and the provider may cause a security violation if it does not correctly impersonate user requests."

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Symptom 2:  I currently deploy network printers to my XP desktops through a GPO that installs the local printers, and uses the "pushprinterconnections.exe" script (from M$).  This method has worked well for a few years plus.  Now, every morning the printers disappear.  I've tried a few fixes including: running c:\windows\system32\wbem\mofcomp scersop.mof to recover the MOF file, running gpupdate /force and rebooting.  These fix the problem most of the time, but the next morning brings lost printers again!

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I am 95% sure this is directly related to DC, and need assistance ASAP.