Corrupted Security Policy on W2K Server

Cosmic One
Cosmic One used Ask the Experts™
I accidentally removed "Everyone" from the "Access this computer from Network" in the Domain Level Security Policy. Now I cannot access the MMC to make any changes to the Active Directory and all Active Directory dependent services fail. The computer is a root domain controller in a forest of itself only. The M$FT method of editing the GP Templates and then forcing a change by SECEDIT did not work and I still cannot access the AD. I cannot delete the AD using DCPromo either because it requires that AD authenticate the person who is uninstalling! I deleted the SYSVOL and reinstalled W2K Server but it came back with the same Secutity Policies!! Is there a brute-force way to reset the Security Policies to default without formatting the drive and doing a clean install? Are there any files I can delete to remove AD and the domain so I can reinstall AD? Thanks!
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From another question about same problem:

1) Change HLM\System\CurrentControlSet\Control\ProductOptions : LanmanNT to ServerNT
2) Reboot.
3) Delete the NTDS folder. 



Thank you very very much Mishou.

Your suggestion did the trick!!

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