Can you try clicking this link in IE and see if you can view the XML for me please:
http://maps.eq2interface.com/POI_fil...afile_list.xml
If you can see it the the problem is that something somewhere is blocking EQ"Map updater from accessing the internet. If you can't then the problem is that something in your internet connection settings is stopping anything accessing that site.
As a slight afterthought, does your internet connection use a proxy?