Automatic works for me, I thinks it's the IE default.
It wouldn't hurt to reset IE to the defaults anyway but that doesn't explain why Firefox doesn't work either.
I can't help you with EI7 defaults but here's a list for IE6 for a guide.
1. Start
2. Settings
3. Control Panel
4. Internet Options
5. Security tab
6. Reset all 4 security zones to Default
1. Start
2. Settings
3. Control Panel
4. Internet Options
5. Privacy
6. Restore 1 Default button
1. Start
2. Settings
3. Control Panel
4. Internet Options
5. Advanced
6. Restore 1 Default button
You may need to do the following as well
1. Start
2. Settings
3. Control Panel
4. Internet Options
5. General tab
6. Remove cookies, temporary files and history
Kudos to Raptor.