I have a 300GB database that has been moved to a new Hyper-V virtual server. How can I recover the disk space from the old db, and the resources consumed by SQL 2008 (on Win2008R2) without damaging or having to reinstall the O.S? I read on an MS Support site that there is a risk the OS would need to be reinstalled. Is it really that risky? As an alternate can I just idle the no-longer used instance somehow?