Windows Explorer opens Search instead of folder

Windows Explorer sometimes opens Search companion instead of folder. This may be caused due to invalid settings for opening folder. It can also be caused due to some external programs (virus).
To overcome this start registry editor by typing “regedit” in run window.
ie) Start --> Run --> regedit and press Enter.
Now the registry window opens. Navigate to HKEY_CLASSES_ROOT \ Directory \ shell. Edit the default value to be explorer or none.