OK, I just remembered why you're seeing those links. At one point, VigLink had a service where they would create product links out of certain keywords on the site. Those links were inserted by them, so they are all hard-coded with the viglink.com URL.
Product links pasted into posts by members were never rewritten, so those would still be valid URLs.
The only way I could think of to remove the links would be to use the content find and replace addon and use regular expressions to remove those links. That is beyond my knowledge, but someone else may be able to help.