Index for Help not found error

[Som76]

Hello! Everyone,
All of a sudden I am not able to use msdn help. When I try to open help, the index list is not visible and display me the message Index file not found.
I feel some file is missing or deleted unknowingly. Please help me.
Thank you all in advance.
Som

 

[LPlates]

Just re-install msdn

 

[Som76]

Thank you for the suggestion, but there is a problem.
For security purpose non of the machines has CD Drive enabled. Only administrator can enable the CD drive and do any installation. But to our bad luck he is not in country currently.
If someone can suggest the file name missing, we can copy the file from another machine. Or if any registry entry missing we do that.
Thanks again for your suggestions.
Som