huh? you only have to check the "remember view settings" option once.. it's a global setting..
After deleting the reg keys, you *should* be able to go back in and set how you want your folders displayed and click the button to "apply view settings to all folders" and it will reset all the folders to the view settings you want.
I did it once early on in my Vista install and haven't had to do it since.. and it was a while ago so I'm running from memory and might be slightly mistaken. I'll give it a whirl soon and test it out again and come back to report..
edit: ok.. just went through these steps again and it does fix it so that when you make a change to a folder, it stays that way. ie: the original post mentioned control panel displaying in detail view instead of icons. After working through the reg key deletes and rebooting, I was able to change to each setting, close control panel, and reopen in the correct/saved view setting. Same thing with the music folders in Vista..
Going through and trying to use the "Apply to folders" button to change each folder to the same view does not work totally. It will still default display the music folder and pictures folder as their default (icons and thumbnails). However, if I go to each of those folders and manually set those folders to a different view (I always like my folders in the details view) it will save those changes the next time I access them.
Hope this all helps.