I have successfully created a Homegroup for my desktop and laptop computer. It works fine, but when I use Windows Explorer to access one machine from the other, it only shows me the various Libraries, and I don’t see how I can search the entire harddrive on the other computer.
Open Homegroup and select the options for sharing. You right click on Homegroup in Windows Explorer to get to Change Homegroup settings. Make sure you created the homegroup on only one of the computers and then join it on the other. See the Homegroup Troubleshooter for more.
Open Network & Sharing Center, Advanced Sharing settings and make sure the settings are correct. File and printer sharing, etc.