These, unfortunatly, are 32 bit drivers not 64bit drivers. Guru3D said they originally mislabled the article because the guy assumed Vista was going to be 64bit only. Here is what the forum post says: "** Update - I relabeled these drivers to 32-bit as they in fact are 32-bit. They should be fully compatible with Windows XP as it's just the normal distribution driver. I initially figured that Longhorn/Vista would be a 64-bit only OS which is not the case, that got me confused For those actually testing Windows Vista Beta, an official driver was posted (32-bit) and can be found in the download section."