Today I upgraded my VirtualBox virtualization software to Sun’s newest and greatest version. Everything worked to plan except that my Bridge Networking on all my virtual machines broke. None of the host machine’s network adaptors would show up on the Bridge networking adapter list. After much fiddling around and searching the Internet I came across a simple solution that worked. After the VirtualBox upgrade, I simply had to re-run the VirtualBox installation package to run a ‘repair’ install. After the repaired installation, VirtualBox recommended a host reboot which I did and now everything works as it should.
VirtualBox 2.2.0 Upgrade Networking Trouble
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The Developer's Tidbits 
Hi Ben
Thanks so much for sharing this info – saved me a lot of time!
I re-ran the install->repair, and, even though the repair process hung (WinXP SP3) and I had to kill the process, the VM started up fine 🙂 🙂
Thanks again
Rgds
HTT