Looking through the Technet, Event ID 1010 refers to Winnt 3.5x. We are running Winnt 4.0 w/sp4 on a compaq R3000 PDC and alike BDC and receiving the following error in the event viewer - The DHCP server encountered the following error when cleaning up the user database: "The system cannot find the file specified". Technet refers to the System.mdb (DHCP DATABASE)which in 4.0 I believe is now called DHCP.mdb stating that it has moved and now cannot find the the file. We have not moved it, yet event viewer is returning this error???? Lost/Help. We also experience logon difficulties, where the domain server cannot be found, when logging on new systems, (Not getting an IP address), but assigning a static address works fine. I'm thinking corrupted DHCP database, Any clues???? Sorry about the points, I just joined and can't afford to use them all in one day.