http://blogs.msdn.com/b/vsnetsetup/archive/2011/01/11/quot-the-application-has-failed-to-start-because-its-side-by-side-configuration-is-incorrect-please-see-the-application-event-log-for-more-detail-quot.aspxPlease refer the following blog link: http://blogs.msdn.com/b/smondal/archive/2010/12/31/quot-the-application-has-failed-to-start-because-its-side-by-side-configuration-is-incorrect-please-see-the-application-event-log-for-more-detail-quot.aspxen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)http://blogs.msdn.com/b/vsnetsetup/archive/2011/01/11/quot-the-application-has-failed-to-start-because-its-side-by-side-configuration-is-incorrect-please-see-the-application-event-log-for-more-detail-quot.aspx#10350444Tue, 18 Sep 2012 11:53:46 GMT91d46819-8472-40ad-a661-2c78acb4018c:10350444Soumitra Mondal<p>Please follow the instructions mentioned in the blog.</p> <div style="clear:both;"></div><img src="http://blogs.msdn.com/aggbug.aspx?PostID=10350444" width="1" height="1">http://blogs.msdn.com/b/vsnetsetup/archive/2011/01/11/quot-the-application-has-failed-to-start-because-its-side-by-side-configuration-is-incorrect-please-see-the-application-event-log-for-more-detail-quot.aspx#10350442Tue, 18 Sep 2012 11:51:20 GMT91d46819-8472-40ad-a661-2c78acb4018c:10350442Nobleteam13245<p>I have the same problem with visual studio 2012 express i cant open it if i try to i get this error : </p> <p>C:\Program Files (x86)\Microsoft Visual Studio 11.0\Common7\IDE\WDExpress.exe</p> <p>The application has failed to start because the side by side configuration is incorrect.</p> <div style="clear:both;"></div><img src="http://blogs.msdn.com/aggbug.aspx?PostID=10350442" width="1" height="1">