This forum is typically used to discuss topics in network application development using System.Net. In order to get the best answer to your question, I recommend trying a forum that is more geared towards Active Directory issues such as:
http://www.windowsforumz.com/Active-Directory-Groups-ftopict549316.html
http://www.mcse.ms/forum44.html
http://www.siteexperts.com/forums/viewConverse.asp?d_id=15000&Sort=0
http://www.netpro.com/forum/categories.cfm?catid=7
http://www.netpro.com/forum/categories.cfm?catid=7
I hope these help to get your question answered.
Mike Flasko
PM System.Net