OS-installed: Windows XP - German Version
As I mentioned I can setup installation of R5.13.9 either english or german - both installations works correctly including help.
Unfortunately it is not possible a second instance of R5.13.9, because come to an other selection in the installer: change/repair/remove.
Tried all, but not language change possible.
So I will stay with the english version - for a correct reporting of other coming problems
Best regards, Karl