Does the Maniaplanet 4 work on win vista? Because I updated the game and after, I tried to launch the game, but nothing happened...it opens a window and then closes it

I already have an account on maniaplanet. If I buy the game on steam, it will connect automatically with my current account or it will create a new one? Or when I buy the game I'll it will be given to me a key to activate on my current account?

It seems that I don't have my station with my titles anymore. Is it just me or...???