Could you run the report below to verify which computer does not have an OS filled in.
Select tblComputers.Computername, tblComputers.ComputerUnique,
tblComputers.Domain, Web40OSName.OSname
From tblComputers Left Join
Web40OSName On Web40OSName.Computername = tblComputers.Computername
Order By tblComputers.ComputerUnique
To use the specified report, do the following:
• Open the Lansweeper configuration console and select Reports & Alerts\Report Builder. Hit the “New” button.
• Copy the SQL code provided and paste it at the bottom of the newly created report, replacing the default SQL code.
• Click somewhere near tblComputers so the new code applies.
• Give the report a “View name” and a “Report name” and hit the “Save” button.
• Double-click on the report in the report list to see its results and export options.