It is a little hard to help without more information.
Visual Studio has so many components, it is possible that you have not done a "full" reinstall, e.g. removed all components before installing again.
I would recommend you look in the event log or try to diagnose this a little bit further to see what the component actually is that is failing so you can address the exact issue.
Alternatively, this could actually be a problem with a third party component/VS addin which is failing to start with VS - and, by clicking OK, you progress without it - but, reinstalling VS won't fix it.
Again, without more information, it is really hard to help.