When you use Start / Search to search for files and folders, you receive a Search Companion pop-up windows that displays an exclamation mark (!) in a yellow triangle.

This behavior is indicative of a damaged or missing registry key and/or associated value data.

To resolve this issue:

1. Copy / Paste the following to a Search.reg file:

REGEDIT4

\[-HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Desktop\NameSpace\\{e17d4fc0-5564-11d1-83f2-00a0c90dc849\}\]

\[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Desktop\NameSpace\\{e17d4fc0-5564-11d1-83f2-00a0c90dc849\}\]
@="Search Results Folder"

2. Merge the Search.reg with your registry or run regedit /s Search.reg.