This should get you in the right direction.

This should give you an indication of what you need and you can add os parameters in if you need it:

SELECT
   [vri3_Computer].[Guid] AS [_ItemGuid],
   [vri3_Computer].[Name],
   [ajs8_vHWComputerSystem].[Model],
   [dca5_AeX AC Identification].[Hardware Serial Number],
   [ld].[Size (Bytes)] / (1024 * 1024) [Disk Size(MB)],
   [ld].[Free Space (Bytes)] / (1024 * 1024) [Free Space (MB)],
   [dca6_HW Computer System].[Number Of Processors],
   [dca6_HW Computer System].[Total Physical Memory (Bytes)],
   [dca5_AeX AC Identification].[OS Name] AS [OSName],
   [dca4_AeX AC TCPIP].[IP Address],
   [dca4_AeX AC TCPIP].[MAC Address],
   [dca5_AeX AC Identification].[Domain],
   [ajs8_vHWComputerSystem].[Manufacturer]

FROM
   [vRM_Computer_Item] AS [vri3_Computer]
      LEFT OUTER JOIN [Inv_AeX_AC_TCPIP] AS [dca4_AeX AC TCPIP]
         ON ([vri3_Computer].[Guid] = [dca4_AeX AC TCPIP].[_ResourceGuid])
      LEFT OUTER JOIN [Inv_AeX_AC_Identification] AS [dca5_AeX AC Identification]
         ON ([vri3_Computer].[Guid] = [dca5_AeX AC Identification].[_ResourceGuid])
      LEFT OUTER JOIN [Inv_HW_Computer_System] AS [dca6_HW Computer System]
         ON ([vri3_Computer].[Guid] = [dca6_HW Computer System].[_ResourceGuid])
      LEFT OUTER JOIN ([vComputer] AS [ajs7_vComputer]
         LEFT OUTER JOIN [vHWComputerSystem] AS [ajs8_vHWComputerSystem]
            ON ([ajs7_vComputer].[Guid] = [ajs8_vHWComputerSystem].[_ResourceGuid]))
         ON ([vri3_Computer].[Guid] = [ajs7_vComputer].[Guid])
   LEFT JOIN dbo.vHWLogicalDisk AS ld
  ON [vri3_Computer].[Guid] = ld._ResourceGuid
WHERE
 [ld].[Logical Disk Type] = 3 AND
 [ld].[Name] = 'C:' AND
    [ld].[Size (Bytes)] / (1024 * 1024) < 20000