I'm totally lost.
Note : I delete in roaming the folder with wallet.dat and reinstall an old one (5 days before today), wallet launchs again but it still unable to synchronize. I find again the same problem that at the beginning.
I can suppose the new wallet.dat was the problem that explains I was unable to open the wallet window.
I've found out that the problem was because of my AV Avast.
Try to disable your AV and your firewall if you have one, before launching the core wallet.