One option is to set a file scan entry for 'c:\pagefile.sys' . You can then make a report to list all computers by the fileversions LastModified date. Below is a report we are using to show workstations with uptime > 7 days.
Select Top 1000000 tblComputers.Computername, tblComputers.ComputerUnique, tblFileVersions.FilePathfull, tblFileVersions.LastModified From tblComputers Inner Join tblFileVersions On tblComputers.Computername = tblFileVersions.Computername Where tblFileVersions.FilePathfull Like '%pagefile.sys' And tblFileVersions.LastModified < GetDate() - 7 Order By tblFileVersions.LastModified