i can't set adobe reader 9.1 as default program to open pdf file, but i can open the pdf files by opening the Adobe Reader and from there open the documents, anyway, that caused a lot of trouble. is there any other way of solving it? i am sorry but i am just a student and i might need a more detailed explanation as i am somewhat computer illeterate.
Please let us know your OS. Without that we cannot help.Generally on installation, Reader makes itself the default application of pdf files. So without more information, I'd just suggest re-installing Reader.