Quick fix shortcut Right click on the .pdf file you're trying to open, click on properties click change, Another window will open, choose the program to open the file which is adobe acrobat reader by navigating to where that .exe file is located which should be in C:\Program Files\Adobe\Reader ...\Reader \AcroRd32.exe and click OK also click OK on properties window Then try to open file it will open adobe reader by default In Windows XP: Go to Control Panel, Select Folder options, select Tab file types, scroll down to PDF Click button Change Click button Browse Browse to C:\Program Files\Adobe\Reader 10.0\Reader\AcroRd32.exe In Vista: Go to Control Panel, Default programs, Set Associations Scroll down to .pdf Click on Change Program Browse to C:\Program Files\Adobe\Reader ...\Reader \AcroRd32.exe |