The SQL Query I use and that works for me:
SELECT TOP (10000) dbo.tblSoftware.softwareName AS Software, dbo.tblSoftware.softwareVersion AS Version, dbo.tblSoftware.SoftwarePublisher AS Publisher,
COUNT(dbo.tblSoftware.ComputerName) AS Total
FROM dbo.tblSoftware INNER JOIN
dbo.tblComputers ON dbo.tblSoftware.ComputerName = dbo.tblComputers.Computername
GROUP BY dbo.tblSoftware.softwareName, dbo.tblSoftware.softwareVersion, dbo.tblSoftware.SoftwarePublisher
ORDER BY Software, Version