The adjusted version of the built-in report which we've pasted below will only check the C-drives of workstations. Instructions for adding this report to your Lansweeper installation can be found
here.
Select Top 1000000 tsysOS.Image As icon,
tblAssets.AssetID,
tblAssets.AssetName,
tblDiskdrives.Caption,
Cast(Cast(tblDiskdrives.Freespace As bigint) / 1024 / 1024 As numeric) As
free,
Cast(Cast(tblDiskdrives.Size As bigint) / 1024 / 1024 As numeric) As
[total size],
tblDiskdrives.Lastchanged As [last changed],
tblAssets.Domain,
tblAssets.Username,
tblAssets.Userdomain,
tblAssets.IPAddress,
tblAssets.Description,
tblAssetCustom.Manufacturer,
tblAssetCustom.Model,
tblAssetCustom.Location,
tsysIPLocations.IPLocation,
tsysOS.OSname As OS,
tblAssets.SP As SP,
tblAssets.Firstseen,
tblAssets.Lastseen
From tblAssets
Inner Join tblDiskdrives On tblAssets.AssetID = tblDiskdrives.AssetID
Inner Join tblOperatingsystem
On tblAssets.AssetID = tblOperatingsystem.AssetID
Inner Join tblComputersystem On tblAssets.AssetID = tblComputersystem.AssetID
Inner Join tblAssetCustom On tblAssets.AssetID = tblAssetCustom.AssetID
Inner Join tsysOS On tblAssets.OScode = tsysOS.OScode
Left Join tsysIPLocations On tsysIPLocations.StartIP <= tblAssets.IPNumeric
And tsysIPLocations.EndIP >= tblAssets.IPNumeric
Where tblDiskdrives.Caption Like '%C%' And Cast(Cast(tblDiskdrives.Freespace As
bigint) / 1024 / 1024 As numeric) < 1024 And Cast(Cast(tblDiskdrives.Size As
bigint) / 1024 / 1024 As numeric) > 1000 And tblComputersystem.Domainrole < 2
And tblDiskdrives.DriveType = 3 And tblAssetCustom.State = 1