My network manager stops running when VirtualBox-4.0 is installed

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http://serverfault.com – I fell into a snare when I downloaded and installed virtualbox 4.0 on my ubuntu 10.4. When I started virtualbox, I saw that the network icon on my desktop showed a red x showing I am disconnected. This happened shortly after I installed virtual box 4.0 I have searched through the web and found some people who have faced the same problem, but the solution didn't work of restarting, starting, and stopping the network manager. I was even thinking of uninstalling virtualbox but not the network connection. (HowTos)