You can find a complete report below that incorporates the where clause found in the reply above. Modify the highlighted text with any other KB number, the report will list all computers that don't have this KB installed.
Select Top 1000000 tblAssets.AssetID,
tblAssets.AssetName,
tblAssets.Domain,
tblAssets.Username,
tblAssets.Userdomain,
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 tsysAssetTypes.AssetTypename = 'Windows' And
Not Exists(Select tblQuickFixEngineering.AssetID
From tblQuickFixEngineering Inner Join tblQuickFixEngineeringUni
On tblQuickFixEngineeringUni.QFEID = tblQuickFixEngineering.QFEID
Where tblQuickFixEngineering.AssetID = tblAssets.AssetID And
tblQuickFixEngineeringUni.HotFixID = 'KB2952664')
Order By tblAssets.Domain,
tblAssets.AssetName