Windows 7: Using 2nd LAN Hardware to tie PCs W7 and XP using a crossover cable

I have a work PC that is part of a domain. It is unusably slow and my administrator cannot get the company to replace it yet, so my plan is to use the domain PC for email and try to do most of my work on another PC that I have (non-domain).

The work PC is running XP 32 bit
The secondary PC is running Windows 7 32 bit

I added a 2nd ethernet card, hoping that I could somehow network them together and get some file sharing working. I have tried to share the files on the secondary machine with the work PC, but it isn't even showing the machine. It only shows the domain. After disabling firewalls on this 2nd ethernet connection, I was able to get each machine to ping each other (set them up as 192.168.1.1 and 192.168.1.2). I cannot get either machine recognized on the other, though.

Am I chasing something that isn't going to work? Does the fact that I am logged into a domain stop a secondary network connection and sharing?

I have enabled discovery, allowed login without a password, and tried a few tips I found on the interweb with no luck.