I've installed the latest VirtualBox 4.1.2 and Ubuntu Server 11.04.
After playing around with the network settings, I found there's no IP address configured for eth1 and eth2. I think I used to have eth0.

Network reads:
Adapter 1: Intel PRO/1000 MT Desktop(Host-only adapter, "VirtualBox Host-Only Ethernet Adapter")
Adapter 2: Intel Pro/1000 T Server (NAT)
How should I setup VirtualBox and Ubuntu so that I can access it as a guest from Windows 7? Ubuntu should also be able to access the Internet.