After I installed Windows Desktop Search (WDS) v3, whenever I right click on a folder and then click on “Search”, WDS opens up. This is not that I wanted. Anyways, to reinstate the Windows Search Companion, this is what you should do:
Open the registry and go to this path and change the value to 0 as mentioned below:
HKEY_CURRENT_USER\Software\Microsoft\Windows Desktop Search\DS\ShowStartSearchBand to 0 to disable the pane.