The reason that pages aren't opening is probably because the mod_rewrite
function in Apache (ISAPI_Rewrite in IIS) hasn't been enabled for your server.
Can you please contact your
hosting provider to see if they can turn on that function in the Apache
configuration file?
We use the mod_rewrite
function in our software to create Search Engine Friendly URL's. So that you can browse around your store until that function is enabled, I would recommend disabling the SEF URL's in your store settings menu of the Admin Control Panel. To get there, click on Settings and then Store Settings in the menu at the top of the page. In the new page that appears, the SEF URL's setting will be towards the bottom of the page.

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