Thank your help, if you have any question about URL Helper, please :
First try the WinPCap official test program.
The "basic_dump.exe" is the WinPCap official test program, it is command-line exe file, please open the "command line" windows, then run it,you maybe get the windows(see pic below), then input 1 or 2 to check if you can capture packet.
Then offer us more details about your computer before we maybe help you, thanks.
2.WinPCap version(Get it from "Control Panel -> Add/Delete Programs")
3.copy the adapter list(see pic below)
4.Run URL Helper and sniff network, check the "Receive packets", are they increasing?