The broken pssetup options are bugs. I fixed them myself, and it should be working when they update next. The \"mgbhelp.dll missing\" one, though, I haven\'t heard yet. Not sure about that one.
If you still want to know what to keep, heres a list:
logs folder
screenshots folder
data\\gui folder
set all the other options by pssetup, when it\'s fixed
With the options files in data\\gui, you might just want to keep the shortcuts list if you\'re having odd problems.
Though, with PS, full reinstalls aren\'t that useful. You can delete any file, and the updater will re-get it. So, a good way to \"reinstall\" is to delete the entire folder you think is messed up (less the options files above) and run the updater.