Once I booted up after the hardware change, Windows XP informed me that my hardware had changed significantly since the OS was initially installed, and asked me to activate windows again.
But that was done painlessly after I installed the drivers, getting connectivity again. First time it has asked me to re-activate.. and I've had numerous hardware changes over the years.
Now, a problem: My darling router has assigned me the IP of 10.0.0.3
All these years I've been 10.0.0.2 - if I can't find a way to give it my old IP back, I'm going to have to manually edit a lot of port forwardings. What a pain.
So, while I have connectivity.. it's limited.
I guess the router saw a new MAC address and gave it an IP that hadn't been used before.
Edit; Yeah! I found a secluded menu in the router configuration where I could reserve an IP address for a specific MAC address. Reserved 10.0.0.2 for Lorelai's new NIC's MAC address, and I am back in business. ^_^