Cognos 10 Public Folder Contents

[Lalit]

Hi ,

I am new cognos user. I got full admin access to run cognos 10. Last time I was trying to set permission for contents in public folder sothat other users cann't see or run pre package or global reports.
Originally in my public folder i have  Master reports, package , global reprots sub folders . After  changing some permission setting , now I can not see these sub folders.
Does any one know how to reset original contents in public folder ?
thanks in advance