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This is quite normal, how is your PC connected to your network Wired or Wireless?
In the case of a Wired connection, it's likely that you're connected to a switched network which restricts traffic to that for the PC on the switch port and broadcast traffic. See the Wiki page on Ethernet Capture for more info.
In the case of a Wireless network, the network adaptor has to be put into Monitor mode to see traffic from other stations and that generally doesn't work well on Windows. See the Wiki page on WLAN Capture Setup for more info.