I say skip the wizard for right now, if you right click on My Computer and you get the properties then click on the Computer name tab what does it say as far as the Workgroup there? Also please make sure that the computer names are not the same other wise you will have name conflicts and nothing will work properly.
Once this is done, I am assuming you are using a router to connect the computers and using dhcp if not do this go to start run type in cmd hit enter
then type in ipconfig make sure that the subnet masks are the same on every computer and that the ip ranges are close as in 192.168.1.XXX or whatever range it uses.
Now I have never been a big fan of network neighborhood. so for example lets choose a folder on your desktop called share right click that folder and choose Sharing and Security.
in the middle there should be a tab that says Share this folder on the network. check that and the box below it that states Allow Network users to change my files. If you want to set security which we all recommend there should be a security spot unless your on windows xp home edition then you have to boot into safe mode to do it.
now to access this folder from another computer you would go to start run and type this
\\IP.Address.here\share <-- This will take you directly to that folder
\\IP.Address.here\ <-- will take you to the computer and show you all nonhidden shares
I know this all seems basic but i tend to forget the basics when I get excited :)
Edit: PS: When you setup sharing you wil know if both computers are setup for sharing or not. if not there should be a spot there that says enable file sharing on this computer click that and then follow the instructions
