As you can see the Explorer sidebar is missing. Does this look familiar? If it does and you want your Explorer sidebar back, follow this guide…
Re-register DLL file shdocvw.dll
In order to fix the missing explorer sidebar, you have to re-register a dll file shdocvw.dll. To do that open up an elevated command prompt and run the following command:
regsvr32 /i shdocvw.dll
DllRegisterServer was not found
If you get the error DllRegisterServer was not found, we’ll have to do some more troubleshooting!
The module shdocvw.dll was loaded but the entry-point DllRegisterServer was not found. Make sure that shdocvw.dll is a valid DLL or OCX file and then try again.
This error message often indicates that a file is corrupt. When a DLL is corrupt, you can simply use the Windows 7 file checker to repair your DLL files.
Windows Resource Protection found corrupt files and successfully repaired them. Details are included in the CBS.Log windir\Logs\CBS\CBS.log For example C:\Windows\Logs\CBS\CBS.log
Remove ExplorerBar registry entry
Open regedit.exe and then uncollapse HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main and delete the registry key ExplorerBar after creating a registry backup.