thomking

I’m running a Home office, I have 4 pc two of which I’m running win98 OS and other two latest one is Win 2003 server and another one Win vista. When I try to make a Network connection its showing error. I just want to know should I upgrade my two pc to win XP or win2003 the error is incompatibility. Is that the only solution for this, any suggestions! Please help. Thanks in advance