I updated my Dell OptiPlex from Windows 7 to Windows 10. My laptop is still running Windows 7 Professional. After the update, my laptop is still recognizing - and trying to connect to - a Homegroup created on the PC under Windows 7. The Windows 10 machine does not recognize the old Homegroup and wants to create one. If I shutdown the OptiPlex I can create an new Homegroup on my laptop but the PC will not recognize it and the Homegroup on the laptop is suggesting joining the old Homegroup even with the new one running. I have tried every solution that I have been able to fine online without success. How can remove the Homegroup created on the PC under Windows 7?