This seems to have solved the problem at last:
Windows 7
Open the Command Prompt window by clicking the Start button, clicking All Programs, clicking Accessories, and then clicking Command Prompt.
or
Click the Start button, in the Search box, type Command Prompt, and then, in the list of results, double-click Command Prompt.
Windows 8 (Using Classic Shell)
Open the Command Prompt window by clicking the Start button, clicking All Programs, clicking Windows System, and then clicking Command Prompt.
Once you have opened the Command Prompt window in the above listed Operating Systems, type in the following:
ipconfig /flushdns
then press ENTER - this will clear the PC's current stored DNS cache settings.
Type in EXIT then press ENTER to close the CMD window.
Windows 8 (Using 'Modern UI interface' tiles)
Click downward-pointing arrow inside circle (at bottom left of Start Screen) - this displays all your Apps by various views - select the Category option (drop-down at top left next to Apps.)
Scroll to the right of all the grouped tiles until you reach the Windows System group, then click on Command Prompt.
Once you have opened the Command Prompt window, type in the following:
ipconfig /flushdns
then press ENTER - this will clear the PC's current stored DNS cache settings.
Type in EXIT then press ENTER to close the CMD window.
To reset the Start Screen in Windows 8's 'Modern UI interface' back to the default tiles, scroll all the way to the left - then click on the upward-pointing arrow inside circle (at bottom left of Start Screen) - this displays all your Apps as normal tiles again .
Now you can successfully reload the SANRAL website again.