If you previously had data on the LUN, then you will need to use space reclamation before you can resize the lun, I believe. I believe there is also a limit to how far (in percent, iirc) you can reduce a filesystem with snapdrive as well and only on win2008, iirc. I'm no wizard on the windows add-on software, so perhaps you will get a better answer soon. At least everyone has a better idea of what you are actually having problems with. Always be as specific as possible with your questions and answers.