If you go to a page and you find that you get either a 404 error, or some other error that says the page is not available, try these steps below:
Retry the web page by pressing F5 while clicking the refresh/reload button.
If that doesn't work let's clear the cache of your browser:
For Firefox: http://pcsupport.about.com/od/maintenance/ht/clearcacheff.htm
For Chrome: http://support.google.com/chrome/bin/answer.py?hl=en&answer=95582
For Safari: http://browsers.about.com/od/faq/f/Clear-Safari-Cache.htm
For IE: http://pcsupport.about.com/od/maintenance/ht/deltempintfilesie.htm