You can use the following report. Please change the red word with the name of the asset group that you want to filter on: 
Select Top 1000000 tblAssets.AssetID,
  tblAssets.AssetName,
  tblSoftwareUni.softwareName,
  tblSoftware.softwareVersion,
  tblAssetGroups.AssetGroup
From tblAssets
  Inner Join tblAssetGroupLink On tblAssets.AssetID = tblAssetGroupLink.AssetID
  Inner Join tblAssetGroups On tblAssetGroups.AssetGroupID =
    tblAssetGroupLink.AssetGroupID
  Inner Join tblSoftware On tblAssets.AssetID = tblSoftware.AssetID
  Inner Join tblSoftwareUni On tblSoftwareUni.SoftID = tblSoftware.softID
Where tblAssetGroups.AssetGroup = '
name of asset group'
Order By tblAssets.AssetName
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.