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.