VPNing from a home network

I am trying to VPN into my office from my home network (peer to peer) If I disconnect the router from the network and plug it into my laptop, I have no problem. VPN works great – unfortunately, my desktop and my wife’s computer loose the Internet. On the other hand, if I connect the router to my desk top (part of the peer to peer home networkk) my wife and I can both connect to the Internet but VPN fails. I believe that it may be a DHCP issue. My home network sees my desktop as 192.168.0.1 conflicting with the server that I am connecting to at work (also 192.168.0.1 on that network.) Any ideas?