Ivo, did you re-register when you installed RSRBR2010? Even though you had that name and number for RSRBR09, you still need to register again (usually with the same info)?
If you did, maybe try re-entering the number, name, and password again in the top left hand box.
If all else fails, go into the Rallyesim forum and ask to have your details registered again manually by the Admin staff. I have seen quite a few people have similar registration problems and the Admin have sorted it for them quickly.