Y'know, after re-reading your OP, and the last two as well, you have done everything I would have done except wipe and re-install again. I don't know if you can do this at your friend's house, but if the ethernet adapter was working at your house, maybe the bugginess happened when you switched to a different router/ DSL modem/whatever. I have no experience with eMachines, but from what I understand, they are kind of a crapshoot as to testing compatibility of components with each other, different software and whatnot. I would (after investing in some Rogaine) eliminate as many variables as possible with this unit and try to get it working where it's going to be working. I mean wipe and install, check onboard. If yes, connect to friend's network. If no, uninstall onboard, restart. No adapter on restart, good. install PCI. You obviously know the slow, painful drill, but at this point that's what I'd do.
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