"I have downloaded the "HTTP Brute Forcer" from hackology.com, but after each of the three tried insatllations I get the following error: "Component 'COMDLG.OCX' or one of its dependencies not correctly registered: a file is missing or invalid."

Google COMDLG.OCX and find a site where you can download the file. Once you've got it drag and drop it into the appropriate Windows folder, probably System*2, and it will register itself.