Welcome to Windows Seven Forums.
To avoid a lot of Q & A about your hardware and OS configuration, please click on this link to Edit System Specs
Filling this out, at least partially, will save a lot of time. Another advantage is when posting a new problem, the person answering can just click the My System Specs link in the bottom of your post. No need to search for the information.
If you have multiple systems just indicate that in the System Specs so that we know why many of the fields are blank.
Are you able to read/write files in the Public folder on the desktop? If not, it's been my experience the fastest way to get the network sharing going is to be able to read and write files in the already shared Public folder. If you can't do that then you can pull your hair out trying to share other folders.