1. Open My Network Places
2. Click "View network connections". You should now see a list of all the network adapters on your computer.
3. Right-click on each item that you DO NOT want to use IPX with and select "Properties"
4. Uncheck the IPX protocol from the list and click OK.
5. Repeat as many times as necessary.
Warcraft 2 will probably run like crap on new computers.