Don't forget your StudioContentdata folder is also vital this is where D|S stores all the geometry and morph info for all the D|S-format scenes you save, converted from Poser format. If you delete or corrupt this folder then you will be unable to load saved scenes properly. So if you're shuffling the Runtime folder out of the way, better do the same for the data folder. There is a way to rebuild a munged data folder, but its a pain in the neck and only works most of the time. One thing to note: this folder is huge with hundreds of thousands!!! of folders and files, so if you're copying it somewhere else, make sure there's room... BTW, simple re-installation shouldn't affect the Runtime or Data folders. I always leave them alone. But if you want to take that little bit extra precaution, go ahead. An extra backup never hurts. =)