Hi esms,
So, I uninstalled it again and tried Xampp. At some stage, once it was installed, it allowed me to alter the password (but from what I don't know as I had never originally set one up). However, when I next run phpMyAdmin, it throws up an error message saying the entered password of 'No' is incorrect !!! I hadn't set the password as 'No', I'd set it as PS3Fails. 
That's exactly what should have happened!!
You hadn't previously set a password, and phpMyAdmin 'knew' that the password didn't exist (or was an empty string) so could get in.
Now you have set the Admin root password, phpMyAdmin doesn't know how to get in, until you tell it, which you would do in wampp or xampp or your phpmyadmin folder, (in Wampp it's: C:\wamp\apps\phpmyadmin3.2.0.1\config.inc.php) open the file 'config.inc.php' and enter the password that you have just assigned to your mySql database, in the line:
$cfg['Servers'][$i]['user'] = 'root'; /* 'Root' is the default username, and you should leave this as it is */
$cfg['Servers'][$i]['password'] = ''; /* Enter your password between the two inverted commas */
PhpMy Admin now knows how to get in, and so will PowerStore 3, with:
localhost
root
yourpassword
your database
neilo
