Sweet! Well, we're glad to have you in the DNN Community and hopefully we can get your issues fixed.

So, since there is no DigArticle module showing up in your extension list, but yet you are getting a DigArticle error on the site... one thing that comes to mind is that maybe a previous admin attempted to uninstall the module, but went about it the wrong way. Maybe they just deleted files instead of uninstalling.

Have you checked the bin folder to see if there is a DigArticle DLL still present there? If so, trying removing the DLL (this will force an application recycle). I'm guessing there may be remnants of the module left somewhere in your instance and that may be why you're getting that error.