The following article comes courtesy of SDV: Some researchers at the recent BlackHat conference have been doing work in the area of Window Vista security and have ( apparently ) found a major hole whereby they can use .Net or similar scripting languages to effectively bypass the memory security functions built into Vista ( DEP – Data Execution Prevention and ASLR – Address Space Layout Randomization ). Once that is done, you have open access to Vista and its internals. The following link from Neowin provides some more information about this potentially devastating ( for Microsoft and those using Vista ) issue.