I am currently running Windows Vista Ultimate SP2 x64 as my main OS, and along with some others I prefer it over Windows 7. But as most of us already know, extended support for Vista is scheduled to end in 2017. So that's only 3 more years until MS kiils off Vista completely In the past I have seen the UUR updates made for Windows 2000 which places XP dll's into the system giving it great compatibility improvements. I was wondering if the same could be done on Windows Vista? Now to clerify, I am NOT attempting to modify the OS source code as that is highly illegal and against Microsoft's terms of service policy. I am just curious if it is possible to use Windows 7 dll's on Vista for compatibility. I own fully legal OEM keys of both Windows Vista Ultimate and Windows 7 Ultimate. So again, not trying to pirate anything or do any sort of illegal activity. I am just wondering if it is possible to use Windows 7 dll's on Vista to help with compatibility. And if so, is it legal to do so? ~Thanks