If you have a number of DHCP reservations or scopes, 87 specifically, you might have a problem opening the MMC snap-in. It is ok if you have 86 or 88. Apparently there is an “error 87” and if you have 87 reservations or 87 scopes the snap-in gets confused. To fix it, you can call Microsoft for the Hotfix, wait for SP2 for Server 2003, or just use the command line to add a nother reservation or scope. For more information, see the KB article below:
http://support.microsoft.com/Default.aspx?kbid=902954