I have 2 PCs each running XP Pro each with internet. Each has an ADSL modem/ router/ switch/ DHCP/ NAT/ UPnP (disabled). The 2 systems are segregated. PC A <==> CAT5 cable <==> modem/router A <==> ADSL line A <==> ISP A PC B <==> USB cable <==> modem/router B <==> ADSL line B <==> ISP B By unplugging the USB cable and running a CAT5 cable from PC A to modem-router B, I have File and Print Sharing. Great! Any combination everything works perfectly. But... ...plugging everything in simultaneously results in wobbly internet on PC B. I am not concerned with internet Load Sharing, the 2 systems can continue to have segregated internet. I want File and Print Sharing at the same time. How to Do? I have these lines of thought... 1. Change modem/router settings. (Yikes! I've been trying that!) 2. Bridging the NIC and USB connections on PC B. 3. Prevent TCP/IP talking between modem/router A and PC B. How to do? 4. Running Firewire between PC A and B.

Adding another nic card to one of the pcs would be an easy solution. as would the firewire/usb cable connection.