Internet Explorer
Click on tools then delete browsing history, then tick the boxes for temp internet files and cookies and click delete
Chrome
Click the wrench at top right and click on tools then clear browsing data, then tick the box for empty the cache and delete cookies and at the top choose to obliterate items from the beginning of time and click clear browsing data at bottom.
Firefox
Click tools then clear recent history, time range to clear choose everything, tick the boxes for cookies and cache and click clear now.
Alternatively
Try holding the ctrl button and press F5 about 6 or 7 times in a row.
