Internet Explorer 9
Click Start, click Control Panel, and then double-click Internet Options
On the General tab under Browsing History click 'Delete'
Uncheck Preserve Favorites website data and check both Temporary Internet Files and Cookies
Click 'Delete'
Click 'Ok'
Restart your computer
Internet Explorer 10
Click Start, click Control Panel, and then double-click Internet Options
On the General tab under Browsing History click 'Delete'
Uncheck Preserve Favorites website data and check both Temporary Internet Files and Cookies
Click 'Delete'
Click 'Ok'
Restart your computer
Firefox
Open Firefox and click 'Tools'
Click 'Clear Recent History'
Make sure Cache, Cookies and Authenticated Sessions are checked
Click 'Clear Private Data Now' button
Restart your computer
Chrome
Type in chrome://settings/ in the address bar
Click on Show Advanced settings
Under Privacy, click on the Clear browsing data button
Check the boxes, Delete cookies and other site and plug-in data and Empty the cache and click o the 'Clear browsing data' button.
Restart your computer
Safari
Under the Safari drop down menu, click on Preferences
Click on the 'Advanced' icon
Click 'Show Develop menu in menu bar' and exit.
Select the 'Develop drop-down menu' Click Empty Cache.
Restart your computer