It's normal that there are only a couple of ping responses to 192.0.0.64 if the camera does not succeed in the handshake with the
TFTP server. The test of the TFTP server takes only milliseconds.
Your network captures have shown that the TFTP server is not responding to the UDP probe packet sent by the camera.
You have tested with the Windows firewall turned off - though have you checked that the inbound rule for 'tftpserv.exe' is 'allow' for UDP (Advanced settings)?
Do you have any of the more sophisticated anti-virus active that provides a form of 'network access protection' that would inhibit the UDP packet such as Symantec Endpoint Security?