Problem adding new Windows 8 to existing Workgroup

I have a home network set up by geeksquad. They have set up a filesharing where the public drive is on my only PC with a Vista Operating sys. They have a WORKGROUP called WORKGROUP. I connect everything else wirelessly. Have 2 Windows 7 Home laptops connected. A shared printer is also connected. I now have a new laptop with Windows 8 and just want to add it in. I named the Homegroup...