If you want to list machines with particular KB updates in place, you can do it like this:
SELECT Top 1000000
tblAssets.AssetID,
tblAssets.AssetName,
tsysAssetTypes.AssetTypename,
tsysAssetTypes.AssetTypeIcon10 As icon,
tblAssets.IPAddress,
tblAssets.Lastseen,
tblAssets.Lasttried
FROM
tblAssets
INNER JOIN tblAssetCustom ON tblAssets.AssetID = tblAssetCustom.AssetID
INNER JOIN tsysAssetTypes ON tsysAssetTypes.AssetType = tblAssets.Assettype
WHERE
tblAssetCustom.State = 1
AND Exists (SELECT
tblQuickFixEngineering.AssetID
FROM
tblQuickFixEngineering
Left Join tblQuickFixEngineeringUni ON tblQuickFixEngineeringUni.QFEID = tblQuickFixEngineering.QFEID
WHERE
tblQuickFixEngineering.AssetID = tblAssets.AssetID
And tblQuickFixEngineeringUni.HotFixID LIKE 'KB3008923%')