Here is the build log (sorry for the language, I wrongly installed my Visual Studio in Italian and didn't find a simple way to revert to English):

Number of downloads: 576
(The lines where you read "mancata corrispondenza" complain about a missing match between chosen project processor reference and XNA processor reference).
Here is the pop-up when I try starting OR:

So replacing XNA would be a great thing. Unfortunately XNA is quite pervasively present in OR, and replacing it is something completely outside my knowledge.