Scan for the file PccNTMon.exe then this report will give you the computers where Trend is not installed:
SELECT TOP (100) PERCENT dbo.tblComputers.Computername AS Computer, dbo.tblFileVersions.Lastchanged
FROM dbo.tblComputers INNER JOIN
dbo.tblComputersystem ON dbo.tblComputers.Computername = dbo.tblComputersystem.Computername LEFT OUTER JOIN
dbo.tblFileVersions ON dbo.tblComputers.Computername = dbo.tblFileVersions.Computername AND dbo.tblFileVersions.Found = 0
WHERE (dbo.tblFileVersions.FilePathfull LIKE '%PccNTMon.exe') AND (dbo.tblComputersystem.Domainrole LIKE '1')
ORDER BY Computer
This report will exclude servers since I only use Trend on PC's