The large part of your problems probably started when you turned your case on its side and switched the ethernet cards.
Make sure that all components in your case are secured tightly. Especially check the ram and IDE cables, these have a tendency to loosen up in my systems.
Next, why Knoppix would not detect your network: Knoppix assumes you have a DHCP setup, and will not assign an IP adress/gateway or such to your ethernet card. If your network requires any of these set manually, you will have to tell knoppix that. On the other hand: I've never gone the trouble to do that so I can't help you there.
To make sure you 'know' what is happening, change one thing at a time.
You know your friend's card works: so insert that, allow knoppix to boot and if you network still doesn't come up, you know that your previous conclusion (about the hardware issue, because knoppix didn't load the network) was unfounded.
I think your older harddrive is dying. While booting knoppix you can remove it (but you can leave the other) to prevent the 'laser' drive from halting your bios. (note: most 'halts' are just 3 minute 'waits')
When windows does that 640x480 thing, load up your original videocard drivers, that should return your settings to a more usable state.
I hope you get your system back!
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"Do not kill. Do not rape. Do not steal. These are principles which every man of every faith can embrace. "
- Murphy MacManus (Boondock Saints)
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