$strComputer = "."

$colItems = get-wmiobject -class "Win32_DiskQuota" -namespace "root\CIMV2" `
-computername $strComputer

foreach ($objItem in $colItems) {
    [int]$diskSpaceUsedMB = [Math]::Round($objItem.DiskSpaceUsed / 2048)

    write-host "User: " $objItem.User
    write-host "Disk Space Used: " $diskSpaceUsedMB
    write-host
}

Read-Host "Press any key to continue...."