I took advantage of the free install of windows 10 from windows 7....working perfectly until just recently had problem when trying to do an update.
The 3 updates wanting to install are KB3116869, KB890830, KB3114399.
When trying to install I get error code oxc000021a, and computer will only re-open if I recover to a previous date.
I have run malware and anti-virus and found nothing.