Ok, you need to use the Registry Editor to perform the tasks you're asking about. Be careful not to change anything yet while in the Editor- a wrong change there can render your system useless!!
Click the "Run..." option under your Start button and type "regedit" (omit the quotes) in the resulting dialog box; this will start the Editor. The window it presents will look very much like what you see when you use Windows Explorer to browse your folders, except for the fact you're looking at the hierarchy of your Registry instead of the hierarcy of folders on your hard drive.
From that initial window it should be pretty intuitive as to how to navigate to the HKLM\SOFTWARE\Classes\Interface\ location ("HKLM" is shorthand for the HKEY_LOCAL_MACHINE root "folder"). Once there, verify that the values in the {00020400-0000-0000-C000-000000000046} key are those given in the article.
Repost here if you have further questions, or if the registry values you find don't match those given in the Microsoft article.