How to Fix a Slow Zune Marketplace on Windows 7 or Windows Vista.
If you are experiencing a slow Zune Marketplace, then Internet Explorer settings have to be changed.
Instructions
1. Open Internet Explorer in Windows 7 from the Start menu or taskbar.
2. Press the "ALT" key on your keyboard to access the Internet Explorer Menu Bar.
3. Select "Tools," then "Internet Options," then the "Connections" tab.
4. Click "LAN settings" and deselect "Automatically detect settings." Click "OK" twice