You may also try to reinstall discovery in somewhat simplified directory, like D:\Disco\ or like this. Some games have problems with too complicated folder locations. It might not be the case, but it might not get things turned worse either.
Oh also, do you have .Net Framework 4 or higher installed?
Aaaalso make sure that disco's folder is in antivirus' exceptions list. AV might have 1234ed something during the installation process.
