How to deal with the association error when the Win7 system opens the PDF file?

How does the Win7 system open the PDF file with an associated error?

1. Click the Start menu — Run, and enter "ldedit" in the Run column. Press Enter;

2. Enter the Registry Editor and click to open. : HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionExplorerFileExts.pdf;

3, under the "OpenWithList", under the registration item, except the "default" & rdquo; registry keys in the right window are deleted, and finally deleted “UserChoice” can be registered;

4. After deleting the registry editor by deleting the above operation, double-click the file you need to open, you can choose the opening method you need.