... on that system. Might be a driver or configuration issue. The only 'issue' with POOL_MANAGED on Windows Vista is related to Virtual Address Space prior to Service Pack 1. See the Gamefest 2007 presentation "Why Your Windows Game Won't Run In 2,147,352,576 Bytes" http://download.microsoft.com/download/e/3/c/e3c25fea-2b53-4174-8729-29a4ec16583b/Why%%20Your%%20Windows%%20Game%%20Won't%%...