I don't know what happened on my system but I would be happy to have some solutions even if it works for others...
And I think it doesn't work for everyone, as I have many customers with the same problem. The difference is that they simply decided to avoid Thinkvantage and not use it anymore...
I don't understand why there is no solution to simply uninstall and reinstall the software... I don't even know which software is managing the "Thinkvantage" key !
And sadly I can't afford a complete reinstall of my computer, I estimated it at around $10'000 (approximately 1-2 weeks of work)...
(Too many softwares and special configs)