"Windows Vista Beta 2 includes a new defense against buffer overrun exploits called address space layout randomization. Not only is it in Beta 2, it's on by default too. Now before I continue, I want to level set ASLR. It is not a panacea, it is not a replacement for insecure code, but when used in conjunction with other technologies, which I will explain shortly, it is a useful defense because it makes Windows systems look 'different' to malware, making automated attacks harder." On a related note, Microsoft is having difficulties in reaching parity between the 64bit and 32bit version of Vista concerning the amount of drivers shipped.