You can left out the 
Inner Join lansweeperdb.dbo.tblNetworkClient On tblassets.AssetID = tblNetworkClient.AssetID
(and the tblNetworkClient.Manufacturer field)
or change it into 
Left outer Join lansweeperdb.dbo.tblNetworkClient On tblassets.AssetID = tblNetworkClient.AssetID