Fix: Windows 10 update stuck at 0% via HTTP Proxy

My new network requires my Windows 10 PC to sit behind an HTTP Proxy.  Normally this is no problem - the proxy settings configured in the browser just work - but sometimes the Windows Update process gets stuck at 0%.  Maybe there's a race condition.

Fix: 
      netsh winhttp set proxy proxy-server="1.2.3.4:3128"
from an elevated command prompt, where 1.2.3.4 is your Proxy server IP