htaccess not calling password popup

Hey,
on just one of our workstations, htaccess is not calling the pop-up for password input...

If you go here you'll see that it calls for a password/username.

What settings, on a PC, would cause this not to show? It seems no-one else is having the problem, all apart from this one PC, even though it's running Win XP SP1, with IE6 (standard stuff nowadays).

Help would be greatly appreciated.

Thanks

 

 

 

 

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