I run a program called Synergy that allows me to use one keyboard and mouse on multiple computers at the same time. It’s a handy feature for power users. Unfortunately, I’ve found that just about any time I install or change any network settings on my Windows 7 box, which is the server for this program, it breaks the set up. I’ve tried all sorts of things, re-installing, troubleshooting the route, turning up logging but I’ve had this happen two times now and the only solution I’ve found is to re-install the Synergy server program AS ADMINISTRATOR. Then it magically works. For what it’s worth, I am running version 1.4.4 64-bit. Hope this helps you if you’re having the same problem. Oh, and the latest change was that I installed OpenVPN.