I tried to emulate the problem and failed. I even registered on the page. But.
Try this. Open the registry. (Regedit)
Open the edit - Find tab.
Click the square at the bottom (Exact match....)
In the search box, type the exact link, including capitals where appropriate, and click "Find next"
If and when you get a hit, delete the entry and press F3 for continuing the search.
MAKE A BACKUP OF THE REGISTRY, before attempting this, unless you are familiar with editing it. (File - export)