What changes did you make in the new GPO? There error that you are
receiving is usually related to a network problem, it can also be caused by
an old proxy client. Try the following articles:
257346 "Access This Computer from the Network" User Right Causes Tools Not
to
http://kb/article.asp?id=Q257346
329887 You Cannot Interact with Active Directory MMC Snap-Ins
http://kb/article.asp?id=Q329887
323542 You Cannot Start the Active Directory Users and Computers Tool
Because
http://kb/article.asp?id=Q323542
280833 Failure to Specify All DNS Zones in Proxy Client Leads to DNS
Failures
http://kb/article.asp?id=Q280833
329642 Error Messages When You Open Active Directory Snap-ins and Exchange
http://kb/article.asp?id=Q329642
If those fail then run netdiag and dcdiag against the DC to check for
errors.
--
Tim Hines, MCSE, MCSA
Windows 2000 Directory Services
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