I'm not an expert by far, but this is how i shared my files from my Desktop to Laptop using Windows XP (Which I assume you are also using)
I slapped a cat5e cable in from 1 computer to the other. clicked on "My Network Places" on both computers, ran "Set up a home or small office network" ran through the wizard. Then I did the wizard on the Laptop, making sure to give the workgroup the same name and the computers themselves different names. The folders that I wanted shared i right clicked, hit "sharing and security..." enabled "share this folder on the network" and enabled "Allow network users to change my files" after that I went to my laptop, hit "My network place" then "View workgroup computers" and there was my files. Sorry if this seems over simplified for you, but I know plenty of people (including myself) that accidently overlook the easy stuff.