Action 1: added
Action 2: Removed
Select tblComputers.Computername, tblComputers.ComputerUnique,
  tblSoftwareHist.softwareName, tblSoftwareHist.softwareVersion,
  tblSoftwareHist.SoftwarePublisher, tblSoftwareHist.Installdate,        
  tblSoftwareHist.Action, tblSoftwareHist.Lastchanged
From tblComputers Inner Join                                         
  tblSoftwareHist On tblComputers.Computername = tblSoftwareHist.ComputerName
Where tblSoftwareHist.Lastchanged > GetDate() - 1
Order By tblSoftwareHist.softwareName