Didn't work with the crosscable Now i'm installing win7 on the unraid box. Will get networking working first.
Edit: Ok, installed win7 on the unraid box. Now if I set both machines to set network settings automatically, they can see each other in the network. But when I set the ip addresses manually, I can't see or ping one PC from the other. So I'm thinking this is basically a problem with how win7 handles networking. What do I do now?
I certainly want to keep win7 on my main PC, so I think think buying a router and trying with dhcp is the only option left.