Hi achu_soosan
I am sorry to say that, maybe no one can answer this one for it is really off topic in this forum, which is dedicated to Visual C++ General Questions. As for Office Automation and PowerPoint Object issue, the right place should be Office Automation newsgroup and PowerPoint newsgroup. There, you have a higher possibility to get an answer, for people there are experts on the field.
http://msdn.microsoft.com/newsgroups/default.aspx?dg=microsoft.public.office.developer.automation&lang=en&cr=US
Please remember to mark the replies as answers if they help and unmark them if they provide no help.