I don't know if anybody ever successfully finished this but there is a key ingredient missing from the above examples. If you want to know if it is installed or not, there is a field in tblFileVersions called Found that is of type bit. Type bit means there is a 0 for false and 1 for true. The statement below will give you all the comptuers where that file was not found and, therefore, is not installed.
SELECT TOP (100) PERCENT dbo.tblComputers.Computername AS Computer, dbo.tblFileVersions.FileVersion, dbo.tblFileVersions.FileDescription, dbo.tblFileVersions.Filesize, dbo.tblFileVersions.Lastchanged
FROM dbo.tblComputers LEFT OUTER JOIN dbo.tblFileVersions ON dbo.tblComputers.Computername = dbo.tblFileVersions.Computername
WHERE (dbo.tblFileVersions.FilePathfull LIKE '%PccNTMon.exe') AND (dbo.tblFileVersions.Found = 0)
ORDER BY Computer
You have to add the CREATE, GO and INSERT into tsysreports table for this to work in the gui console. There are plenty of examples in the other posts to guide you through that.