I was having the same problems with the MiniApplication Launcher crashing, so I tried uninstalling Kies mini and then reinstalling it. This didn't work.
After that I came to this forum and tried to install the .net framework 4.0, but this didn't work either. Then I tried uninstalling IE 9 release candidate thinking that could not possibly work, but it did! I'm not sure if IE was the culprit or a combination of both, but that worked for me.