ADSL modem is in place. I want to add this to it and create simple network. Modem is simple isp one with phone cable connected to one machine.
I am assuuming you may have a USB Modem (like a speedtouch)? If so this will lack the RJ45 ports and associated switching that you need to create a network.
It is possible to joint computers together with a network cable aloine to make a peer to peer simple network but to be honesrt the one time I tried it I ended up pulling my hair out.
So simple ways to get things moving
1. If it is a USB modem then a chane to an ADSL Modem Router is probavly your best solution - one with 4 ports on it for Cat5e cables. (see 3 below)
2. If it is one like Talk Talk used to send out - with just 1 RJ45 poprt connecting to your PC then a 5 port simple switch for about £7 - £8 will do the trick
3. As suggested above - if you have an ADSL USB modem then have a word with your ISP about an upgrade to their latest modem router - it may be free but equally they may want a contract extension as part of sending you one.
For more help if you can let us know what make and model your current modem is (and ISP name too) we may be able to help more.
Whatever solution you follow the OS issue of sharing PC access to the 2 PCs stays the same.
C