On your Pro machine, go to the file settings and uncheck the simple file sharing permissions. Go back to the folder you want to share on your main PC and click on the sharing properties. Click share this folder and go to the permissions tab. Make sure the "everyone" group is highlighted and look at the three boxes that can be checked. Determine what access you want the everyone group to have and check those boxes. After this is done, restart both machines and it shoudl allow sharing now. If not, give it a few minutes then try accessing the folder from the laptop. That should fix it. I have seen this problem before. and this fixed it. If you are wanting to share any files from the laptop, make sure the guest account is turned on it so that the main PC can access it's shared files. Hope that helps.....