Intrusive update: please note that this answer is outdated, with recent versions (>=2.4.0) scapy will ONLY require Npcap (or Winpcap) to work, and IPython for the console. Have a look at the official windows page
In case someone needs Scapy for 64-bit + Python 2.7, I’ve uploaded the binaries here:
https://github.com/Kondziowy/scapy_win64
In addition, you probably need to install WinPcap from the official site
Compiling it yourself required a few fixes – I’ll commit them upstream soon.