The following report lists domain users and the computer names on which the accounts themselves or the AD group they are direct member of is member in a local administrator group.
Select Distinct Top 1000000 tblADusers.Username,
  tblADusers.Userdomain,
  tblAssets.AssetID,
  tblAssets.AssetName
From tblADusers
  Left Join (Select tblUsersInGroup.Username,
    tblUsersInGroup.Domainname,
    tblUsersInGroup.AssetID
  From tblUsersInGroup
  Where tblUsersInGroup.Admingroup = 1) tUsersInGroupAdmin
    On tblADusers.Username = tUsersInGroupAdmin.Username And
    tblADusers.Userdomain = tUsersInGroupAdmin.Domainname
  Left Join (Select tblUsersInGroup.AssetID,
    tblADMembership.ChildAdObjectID
  From tblADMembership
    Inner Join tblADGroups On tblADMembership.ParentAdObjectID =
      tblADGroups.ADObjectID
    Inner Join tblUsersInGroup On tblUsersInGroup.Username = tblADGroups.Name
  Where tblUsersInGroup.Admingroup = 1) tADgroupAdmin
    On tADgroupAdmin.ChildAdObjectID = tblADusers.ADObjectID
  Left Join tblAssets On tblAssets.AssetID = tUsersInGroupAdmin.AssetID Or
    tblAssets.AssetID = tADgroupAdmin.AssetID
  Left Join tblAssetCustom On tblAssets.AssetID = tblAssetCustom.AssetID
Order By tblADusers.Username,
  tblADusers.Userdomain,
  tblAssets.AssetName,
  tblAssets.AssetID