I recently downloaded Visual Studio 2012 RC to start playing with all the new goodies, templates and tools coming in the new version. I was able to install it and run it without issues the first time.
However, after I closed it and tried to re-open it (and I believe restarted the machine in between) I got the error “devenv.exe - Entry Point Not Found” and VS refused to run at all !
Awful error, no description, no clue. However it seems that the community already caught it and Microsoft was quick to release an update to fix the issue. Many people are having the problem when installing both Visual Studio 2012 and Office 2013, which was not my case.
The update seems to fix the problems for all reported cases, and it fixed it in my case. You can get the update here.