Ok...I read the post about networking and I have a kind of similar problem....Both computers are online, etc. but I can't get them to communicate with each other. One(A) shows both computers when I hit view Workgroup Computers (I can't access B comp in any way shape or form however despite setting up a shared drive) but the other(B) says I have no access to the workgroup. I'm really at a loss...I've set the network up before and I've done everything the same but it just doesn't want to work. Any suggestions would be greatly appreciated. Thanks 
Thanks for all the help...and so quick too