Dear Cvp or Arun,
Thank you for your query.
This seems to me a pure installation issue and not at all Revit API related.
Please note that this discussion forum is dedicated to programming Revit using the Revit API.
Therefore, you cannot expect an answer to a question such as yours relating to installation, product usage or end user support issues here.
You should try one of the non-API Revit product support discussion forums instead for that:
http://forums.autodesk.com/t5/revit-api/this-forum-is-for-revit-api-programming-questions-not-for/td...
I hope this clarifies.
Thank you for your understanding.
Best regards,
Jeremy