I cant open quest editor and also cant open any game. I've tried uninstallind, but it did not work. When i try opening it says:

System.InvalidOperationException: An error occurred creating the form. See Exception.InnerException for details. The error is: Attempted to read or write protected memory. This is often an indication that other memory is corrupt. ---> System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
--- End of inner exception stack trace ---
at TextAdventures.Quest.My.MyProject.MyForms.Create__Instance__[T](T Instance)
at TextAdventures.Quest.My.MyApplication.OnCreateMainForm()
at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.OnRun()
at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.DoApplicationModel()

Have a look here for a possible solution:

https://github.com/textadventures/quest/issues/885