error code 0x80070005 DHCP mmc can't edit any DHCP

Hi ,

I believe this has happened because of a malicious icmp / arp attack on our network.

I've tried re-installing, with a renamed mdb file , still won't open the zone configs (Same Error).
DHCP is still working , it is issuing IP #'s from the defined zones.


I can't configure DHCP at all I get the following error in the "Setup Events" in event viewer ...

"Installation succeeded with errors.

Roles:

DHCP Server
   Error: Attempt to configure DHCP Server failed with error code 0x80070005.  Access is denied"

System

- Provider [ Name] Microsoft-Windows-ServerManager [ Guid] {8c474092-13e4-430e-9f06-5b60a529bf38}

EventID 1614

Version 0

Level 2

Task 0

Opcode 0

Keywords 0x4000000000000000

- TimeCreated [ SystemTime] 2013-03-07T09:31:29.506Z

EventRecordID 36

Correlation

- Execution [ ProcessID] 10920 [ ThreadID] 11160

Channel Setup

Computer POWERCONSSERVER.pwrcon.local

- Security [ UserID] S-1-5-21-1242426526-4073761284-3713052023-1142

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Best Regards Bernhard