Error message when trying to open Control Panel or System Properties

Inspiron 530

Running Vista Home Basic SP1

When trying to open Control panel from the Start, Programs Menu, or right click on Computer to go to System Properties, I get the following message in a small window:

Control.exe

shdocvw.dll not found - reinstalling may fix the problem

Any ideas on whether to try replacing the dll file or should I try using Start Up Repair from the Advanced Boot Options Menu?

The system is clean otherwise. I have run a complete Avast Antivirus scan, Malwarebytes scan, Hijackthis, and Windows Defender scan.