' Modify an Existing Quota Entry
strComputer = "."
Set objWMIService = GetObject("winmgmts:" _
& "{impersonationLevel=impersonate}!\\" & strComputer & "\root\cimv2")
Set objAccount = objWMIService.Get _
("Win32_Account.Domain='fabrikam',Name='bob'")
Set objDisk = objWMIService.Get("Win32_LogicalDisk.DeviceID='C:'")
Set objQuota = objWMIService.Get _
("Win32_DiskQuota.QuotaVolume= " & _
"'Win32_LogicalDisk.DeviceID=""C:""'," & _
"User='Win32_Account.Domain=""fabrikam"",Name=""bob""'")
objQuota.Limit = 11111111
objQuota.Put_