If your Vue won't start, you may want to delete your environment files. Sometimes these files get messed up and prevent Vue from starting. The extension of these files is .env and they're located in a folder called "Environment", somewhere under an e-on folder (I don't remember now where that is exactly but you can easily find it with the Windows search function). That's where Vue saves the options you chose and other stuff concerning your system, preferences and environment in general. If you delete them, Vue will recreate them. Of course, you'll have to redefine your options.
Hope that helps.