You installed Eraser 6 over Eraser 5 without uninstalling Eraser 5 (which is, in effect, a completely different program) first.
Uninstall Eraser 6, then uninstall Eraser 5 if it is still in the list of installed programs. If it isn't, delete the Eraser folder, and all traces of Eraser you can find. Then run a registry cleaner (such as the one in CCleaner), and only then reinstall Eraser 6.
David