thought about using wireless but the problem is that there is more then one network device at the two points i want. if i get wireless i cant connect the two routers i already have to each other, and if i do it though a pc it means that pc must be on all the time...
If I understand you correctly, you have 2 PCs next to eachother plugged into a router. In another room (for example), you have another PC and a print server. Currently these are connected to the router next to the 2 PCs via a cable.
I have a similar setup (2 routers but one router has a built in print server). I have one cable running from my router/modem to the router/print server. The main PC is connected to the router/modem via a cable and the 2 laptops connect to the router/modem wirelessly.
Because the 2 routers are connected via a cable, I have disabled the DHCP server on the router/print server and it gets allocated an IP address by the router/modem. I can therefore connect to everything.
I think you would have to have one cable connected between the routers unless there is some way you can set up the secondary router as a wireless access point (not a router). Then, connect the PC and print server to the secondary router/wireless access point and it should talk to the main router.
I don't know for sure though! Perhaps you should also try posting in the Networking forum.
There is a big difference between one router with multiple clients and two modems or routers. Two modems will contend with each other because they will both try to be connected to your ISP at the same time and the ISP is likely to cope with only one connection at a time (sort of like trying to log into a website when you're already logged in). A router obviously doesn't suffer from that and it can handle the contention issue because it, well, routes the bandwidth according to need.
So yes, it is theoretically possible to have two modms on one line, but if both are running, they are quite likely to fail to connect.