Hi Mickaël,
without error logs this might not be possible to debug. Are you sure you get no error logs when this exception occurs?
Do you see this for all projects and workspaces?
Your installation log shows a successful installation. The only thing there to note is that two drives where used . ... did you install into program files? If so this may be part of your problem .. or if there is a lingering connection somehow between C and M.
Best Regards,
Lisa