no me permite crear un nuevo projecto

necesito ayuda,acabo de instalarme el unity 3d version personal y quise empezar un projecto pero me dice que no puedo,¿que devo hacer?¿devo volver a descargar el unity?

Mod edit: Google translation:

I need help, I just installed the
Unity 3D version staff and wanted to
start a project but says I can not,
what devo do? devo re-download the
unity?

I need help, I just installed the Unity 3D version staff and wanted to start a project but says I can not, what devo do? devo re-download the unity?