Simple neworking
What the network wizard does for you is a few very simple things.
If you have two or more computers you want to network, the first step is to make sure both have an IP Address which is in the same range. For example one could be 192.168.0.11 and the other could be 192.168.0.12 - these computers are on the same range. So first step START -> RUN -> CMD and type in 'ipconfig' without the quotes. You should see IP Addresses similar to described above.
Once you have verified that, make sure both computers are in the same workgroup or domain: RIGHT-CLICK My Computer -> Choose PROPERTIES -> Select The COMPUTER NAME tab -> make sure where WORKGROUP is listed, all computers have the same (IE MSHOME or WORKGROUP or HOMEGROUP or just about any damn thing you want).
If they aren't identical make them so by choosing the CHANGE button and entering the relevant workgroup name under where it says "MEMBER OF".
If you do change the workgroup you'll have to reboot. Once done, you need to share resources on the network. To share folders, right-click on a folder and choose "Sharing and Security". You should see a section for "Network Sharing and Security". It may not be enabled by default, but there is a link that says "If you understand the risks etc etc etc" - click that link, you will be prompted (choose JUST ENABLE FILE SHARING) and sharing will be enabled.
At this point, you get tickboxes which ask "share this folder on the network" - tick that and enter a name for the share (such as "DOWNLOADS"). You also have the option "Allow network users to change my files" - you can tick that if you want to be able to add files to the share, delete files and modify files from other computers.
There are also more advanced sharing options for specific users etc, but I'll leave you to research that. If you follow all that you should be able to see shares on the network. You can share printers, cd drives etc etc as well.