I did that registry wipe 3 years ago when I was starting out with what I think was ds3 version .44  something like that because I had made a mess of my runtimes. If you say just uninstalling my current 2 versions of Studio CMS and current default content is prolly the way to go. I will do that 1st then if somehow there are major issues then can go for the full wipe.. There is also files in Appdata and common files somewhere too if I remember correctly but I think you are right it will not need to get to that point....