Win7 System open PDF file associated error How to deal with?

Win7 System open PDF file associated error How to deal with?

1, click Start Menu-run, and enter "regedit" in the running column to press ENTER;

2, enter the Registry Editor, click on the order to open: "Hkey_current_usersoftwaremicrosoftwindowscurrentversionexplorerfileexts.pdf;

3, the "Openwithlist" registration, the right window in addition to the "(default)" Outside the registry key to delete all, and finally delete the "Userchoice" registration;

4, through the above operation to delete the Registry Editor, and then double-click the file you need to open, you can choose the way you want to open.