A Windows Vista-based or Windows Server 2008-based computer may stop responding during a storage stress test or under similar conditions
You have a computer that is running Windows Vista or Windows Server 2008. However, the computer may stop responding (hang) under certain conditions. For example, the computer may stop responding during a storage stress test or under similar conditions. When this issue occurs, you have to restart the computer.
For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB958960.