This link?
http://www.canadiantire.ca/en.html
Have you restarted everything (computers, modem, router) since the problem appeared?
See if clearing the cache helps;
* Internet Explorer:
Internet Options> General tab> Browsing History> Delete> uncheck "Preserve Favorites website data" then delete Temporary Internet Files. No reason, yet, to delete cookies, history, passwords, etc.
* Chrome:
Options> Settings> Advanced> Privacy> Clear browsing data> Cached images and files.
Don