It's a rather old post, but this did the trick for me:
Select Top 1000000 tblAssets.AssetID,
tblAssets.AssetName,
tsysAssetTypes.AssetTypename,
tsysAssetTypes.AssetTypeIcon10 As icon,
tblAssets.IPAddress,
tblAssets.Lastseen,
tblAssets.Lasttried,
tblUsers.Name,
tblUsers.Disabled
From tblAssets
Inner Join tblAssetCustom On tblAssets.AssetID = tblAssetCustom.AssetID
Inner Join tsysAssetTypes On tsysAssetTypes.AssetType = tblAssets.Assettype
Inner Join tblUsers On tblAssets.AssetID = tblUsers.AssetID
Where tblUsers.Name = 'Guest' And tblUsers.Disabled = 'False' And
tblAssetCustom.State = 1