I've registered for Win 10, so I check each day to see if any new updates have arrived.
Today a few times I saw error 80244019 and an update failure.
When you look up the error code you find:
Windows Update error 80070422, 80244019, or 8DDD0018
where it claims:
"If you receive one of these errors while downloading updates, the most common cause is a computer virus that has turned off Windows Update, or another service on your computer that is needed by Windows Update."
which is kind of scary.
However, trying a little later, I see things work and there's nothing new.
I suppose the Windows servers are getting jammed and thrashed around quite thoroughly.
Funny how 'Get Windows 10' may cause MS to have a denial-of-service attack of their own making.