As you mention the 90's you're probably referring to their embrace, extend, extinguish strategy. This situation with the sound card hardware mixing was quite di

As you mention the 90's you're probably referring to their embrace, extend, extinguish strategy. This situation with the sound card hardware mixing was quite different and a lot later. Windows Vista moved away from kernel mode drivers where possible to help address the issue of BSODs which were not uncommon on Windows XP. It turns out that Microsoft was incorrectly getting the blame for BSODs when it was actually the fault of buggy video and sound card drivers. While Vista was regarded as a "bad" Windows, it laid most of the foundations which allowed Windows 7 to be regarded as "really good" (by Windows standards). From a hardware perspective, by the time Windows 7 arrived pretty much all drivers had been updated for Vista and had their kinks worked out (mostly, I would still have my NVidia drivers crash on occasion, but because they were user mode now, instead of a BSOD the screen would go black for a few seconds after which my desktop would come back with a Windows pop-up saying something to the effect of "the video drivers crashed and had to be restarted", the real perpetrator now being blamed!). Windows 7 also did optimizations to make things less resource intensive and it also helped that PCs had more RAM compared to when Vista came out. On the UAC front Windows 7 was also much better, they calibrated the UAC prompts to come up less often, but what also happened is a lot of the 3rd party software which was needlessly requiring admin rights for no good reason (except that it was badly written), had finally been fixed by the time Windows 7 was released.