Change the Default Program for PDF Files
Often times you'll get an update to Adobe Reader which is the free PDF reader program, but may be using an older version of Adobe Acrobat (e.g. version 7, 8 or 9 --- while XI (11) is the current release). Almost as a way of them encouraging you to upgrade your PDF making application (Adobe Acrobat).
Follow the steps below to switch back the default program to open PDF files in Windows 7
- Click the Start button on your Windows 7 desktop and select Default Programs.
- Click Associate a file type or protocol with a program.
- Scroll down to locate .pdf in the Name column. If you see Adobe Acrobat in the Current Default column, then click to select .pdf and click the Change program button. Proceed with Step 4.
If you see Adobe Reader in the Current Default column, then you do not need to change the program. Click the Close button and you are finished with these instructions.
- On the next screen, choose Adobe Reader and click OK.
Note: You can choose to open a PDF with Adobe Reader by right-clicking the file and selecting Open With and Adobe Reader from the menu.
Document source - http://its.uncg.edu/Software/Available/Adobe/Default_Association/