This is what I use:
Select Top 1000000 tblAssets.AssetName,
tsysOS.OSname,
tsysOS.Image As icon,
tblAssets.OScode,
tblAssets.IPAddress,
tblAssets.Lastseen
From tblAssets
Inner Join tblAssetCustom On tblAssets.AssetID = tblAssetCustom.AssetID
Inner Join tsysAssetTypes On tsysAssetTypes.AssetType = tblAssets.Assettype
Inner Join tsysOS On tblAssets.OScode = tsysOS.OScode
Where tblAssetCustom.State = 1
Order By tsysOS.OSname