Visual studio 2010 IDE not starting

I have visual studio 2010 installed and working but just after re-starting my system i am not able to start development environment - I am getting following error -

Could not load file or assembly 'Microsoft.VisualStudio.Shell.UI.Internal,Version=10.0.0.0,Culture=neutral,PublicKeyToken= b03f5f7f11d50a3a3 or one of its dependencies.The file or directory is corrupted and unreadable (Exception FROM HRRESULT=0X80070570)

Can anyone has any clue what could be the reason ?

Try to repair the installation via Control Panel