Uninstaller couldn't delete the rc3 folder on windows 7
Uninstaller couldn't remove the rc3 folder in Program File on Windows 7 (Vista). But it can remove desktop icon and kepler menu item on "Start" menu.
RC2 uninstaller has the same issue.
Morpho had the same problem. But after upgrading IzPack to 4.3.1, the bug was fixed.