Well, I didn't expect so many replies to my post but Vista was just slow and you had to dig a hole to find what you were looking for. Changing its overall settings could have been made much easier. That's been kind of fixed in 7, I know.
I just think there's alot of whistles and bells that I don't need and also there's alot of annoyances that weren't there in XP really. It takes precious time to get used to what's been changed and to figure out how to overcome new problems, and a few new bugs as well. That's why my enthusiasm towards 7 is somewhat moderate for now, even though I must admit it could have been alot worse nevertheless.
As far as smooth video playback goes, the framerate of most of my movies is 23.976 so that means I have to use a custom resolution for 1080p, 1920x1080 23.976 Hz 32 bit. Player software that 'converts' it to 24 or 60 will always cause visible judder. So actually the correct term here is 'upsampling' and not 'upscaling', I apologize for that. So far, I have only found one player that's capable of letting me entirely avoid micro stutter with 23.976 framerate files.