MS WORD How to disable Ctrl+PageDown/up going to next search result

If what you want is to having Ctrl+PageDown/Up working always as "Go to next/prev page" and you are willing to loose Find Next/Prev functionality for it, here is how to do it:

1. In Word, press Alt+F11 to open Visual Studio for Application.
2. Add a new module to Normal. (Right click on Normal in Project explorer box, Insert > Module).

3. Add there the following code:

   Sub JumpNextPage()
   With Application.Browser
       .Target = wdBrowsePage
       .Next
   End With
   End Sub
   
   Sub JumpPrevPage()
   With Application.Browser
      .Target = wdBrowsePage
      .Previous
   End With
   End Sub
   

4. Now we are going to assign Ctrl+PageDown/Up to run these macros. First, go to File > Options > Customize Ribbon. (I'm using Word 2013, but it should be the same from 2007, and even with earlier versions there is an equivalent way to find the dialog we need.)

5. Click on “Customize...” button in the bottom of left column appears in the right pane, which has the label “Keyboard shortcuts” before it.
   
   
6. Browse to “Macros” category and assign the wanted shortcut key to the macro (making sure use save the changes in Normal.dotm, so it’ll be available to all documents).
   
   
   BTW, you can see that currently the key combination is assigned to “BrowseNext”. This is how I found the command name for the restoring step below.
   
   
   This way you can also remove key combinations that you don’t like, by trying to assign the key to any command, seeing the command name it currently assigned to, searching for this command in “All Commands” category, selecting the key in “Current keys” box and pressing “Remove”.
7. That's it. Now Ctrl + PageUp/Down will jump pages only, even after some search.

Please note the following:

• Now, even selecting other objects on “Go To” dialog (the one in your screenshot) will be reset to “page” when you use the shortcut keys.
• As mentioned above, now you don’t have any obvious “Find Next” shortcut key.
  Still, if you close the Find dialog box, Alt+Ctrl+Y or Shift+F4 work as Find Next! (But there is no Find Previous.)
• If you want to restore the original key behavior, you can use the “Reset All..." button appears in the same, or just set the specific keys back by browsing to “Commands Not in the Ribbon” category, then to “BrowseNext” and “BrowsePrev” commands and re-assing the shortcut keys to them.