The first DC, Windows 2003, used to build the forest and domain failed and is unrecoverable. We tried to slave the drive but our efforts was unsuccessful. All of our other DCs are running Windows 2008 R2 and our forest and domain functional levels are Windows 2003. All AD Roles are on the Windows 2008 R2 DC. Can I stand the replacement DC as a Windows 2008 r2 DC? Do you foresee any problems?