Windows 7 does not see other network PCs

Go to Control Panel Network Settings

1. Leave homegroup.

2. "See Full Map" in right upper corner to show network devices.

In VirtualBox go to Settings > Network > Attached to > Bridged Adapter.

ping 192.168.1.1

Reset network settings in cmd, if necessary:

ipconfig /release

ipconfig /renew

ipconfig /flushdns