Please use the following report:
Select Top 1000000 tblAssets.AssetID,
  tblAssets.AssetName,
  tblOperatingsystem.Caption
From tblOperatingsystem
  Inner Join tblAssets On tblAssets.AssetID = tblOperatingsystem.AssetID
Where (tblOperatingsystem.Caption = 'Microsoft Windows 7 Professional') Or
  (tblOperatingsystem.Caption = 'Microsoft Windows 7 Enterprise')
To use the report above, do the following:
•         Open the report builder under Reports/Create New Report.
•         Paste the SQL code we provided at the bottom of the page.
•         Left-click somewhere in the upper section of the page so the code applies.
•         Give the report a Title and hit the Save & Run button to save it. Export options are listed on the left.