title: Visual Studio won't open C# projects
body: <p>Starting from yesterday, whenever I try to open a C# project (.csproj) in visual studio 
  <br>I get this 3 times:<br>
  <img src="https://i.stack.imgur.com/OhBXm.png" alt="enter image description here">
  <br>And then I get this 1 time:<br>
  <img src="https://i.stack.imgur.com/3SNva.png" alt="enter image description here"><br>
  And thus it doesn't open the project.<br>
  This doesn't appear when opening C++ or VB projects, only C#<br><br>
  I have tried running the application with parameters like /resetsettings and /resetskippkgs  but it didn't do.<br><br></p>
  
  <p>Please help me solve the problem</p>