I am pretty uncomputerate, but:
1. If Cupalloys are in your Favorites, perhaps their address has got corrupted. Delete them from Favorites, use your browser to find them again, and add them as a "new" Favorite.
2. Maybe Cupalloys has sent you a dud cookie. It might be worth deleting their cookie from your computer, then trying to raise their website again.
If you use Internet Explorer, open it, click Tools then Internet Options, then on the General tab, under Browsing History, Click Settings, then View Files. That lists hundreds of cookies. Click on the Name column heading, and they will appear in alphabetical order. Look for one called cookie.me@cupalloys or similar, right click on it and then left click on Delete.
Then close everything back to Internet Explorer, and try Cupalloys again.
It is possible to do a wholesale deletion of all cookies, but this will cause a lot of your Favorites to forget your details so isn't advisable.
Andy