The project file could not be loaded. Data at the root level is invalid. Line 1, position 1

For some reason my visual studio projects do not work, all I can achieve is to get this message:

  

The project file could not be loaded. Data at the root level is invalid. Line 1, position 1.

The file that indicates if it exists on my computer:

Also, reinstall visual studio.

If someone knew how to solve it, I would appreciate it very much: