1. Download this file:
2. Save the .zip file to your desktop.
3. Open the downloaded .zip file, then extract (drag and drop) the .reg file to the desktop.
4. Right click on the extracted .reg file and click on Merge.
NOTE: If you wish to see what changes will be made by the REG file, then you can right click on the extracted REG file and click on Edit to see the default registry entries that will be added. REG files are just text files. The "Edit" function just opens them in Notepad.If you do not see a Merge option when you right click on the REG file, then you will need to check in Default Programs to set the reg file extension to have it's Current Default program set as Registry Editor (C:\Windows\regedit.exe). Afterwards, try merging the REG file again.
5. If prompted, click on
6. When done, you can delete the downloaded
.zip and.reg files on the desktop if you like.
7. Log off and log on, or restart the computer to apply.
Looks like all the default associations on your system, have been changed to Adobe Reader. This may have been due to the fact that you had installed Adobe Reader from a third party site. Going forward, please install Adobe reader from the Adobe website only (http://get.adobe.com/reader)
As far as restoring all your default associations, please follow the above instructions. They should help you restore all the file associations which have been changed. You can also have a look at: http://answers.microsoft.com/en-us/windows/forum/windows_7-files/how-can-i-restore-the-def ault-file-associations-in/c096cd7a-91cd-4460-af4d-f38d7ca54860
Hope this helps