Unable to run Grasshopper with the "Grasshopper" command

Hello everyone,

I Have Rhino 4 SR 9.

First I had trouble loading Grasshopper ("exception occured in plug-in etc.....") but I fixed it downloading the 2005 "X86" Runtimes version.

Now everything seems to work. I can load Grasshopper in the plug-in manager. But when when I come back to Rhino, if I type "Grasshopper" in the command line I can read "unknown command"? Why the hell?

Thanks a lot,

TF