Report on Specific Child OUs

[brodiemac2]

I'm trying to modify some of the pre-built reports on Users to only look in specific OU so I don't get reports filled with all the superfluous built-in accounts in AD. This is what I have but it's not working properly. Any help is appreciated.

Select Top 1000000 Case
    When tblADusers.Displayname Is Null Or
      tblADusers.Displayname = '' Then tblADusers.Userdomain + '\' +
      tblADusers.Username
    Else tblADusers.Displayname
  End As Displayname,
  tblADusers.Username,
  tblADusers.Userdomain,
  tblADusers.Department,
  'usersm.gif' As icon,
  tblADusers.IsEnabled As EnabledInAD,
  tblADusers.Lastchanged,
  tblADusers.OU
From tblADusers
Where (tblADusers.Department Like '' Or tblADusers.Department Is Null) And
(tblADComputers.OU =
  'OU=Location,OU=Users,DC=company,DC=com') Or
  (tblADComputers.OU =
  'OU=Location,OU=Users,DC=company,DC=com'))
Order By Displayname