I upgrade to win 7 since then I can not open pdf files. I already check for solution but nothing works. Please
I need help on this
The pdf format is a third-party format, so Windows has no ability to open it. You need to install a third-party program to do so.
The standard such program, which most people use, is the free, downloable Adobe Reader. However instead I recommend that you download and install the free Foxit Reader at http://www.foxitsoftware.com/Secure_PDF_Reader/ . It's much better and much faster.