New
#1240
Avast used to issue new signatures 5 or more times a day. Updates to Defender are a good sign, other security updates are attempts to plug the sieve all OSes are.
My upgrade from Windows 7 OEM shows as Windows 10 Pro Retail. Doesn't really surprise me though. If you upgraded an OEM install and it stayed OEM, that would normally mean you call the OEM for tech support. Why would they help you if you did a free upgrade to an OS their device never shipped with? Makes more sense for Microsoft to assume responsibly for any issues as a result of the free upgrade, thus your Windows 10 becomes Retail and you call Microsoft for tech support.
This has been answered numerous times here -- but I don't have the thread links handy. Basically, Win10 "reuses" the existing Win 7/8/8.1 license for the upgrade. This means that "legally", you are not allowed to continue to use that instance of Win 7/8/8.1 anymore. Whether or not it is technically possible, no one knows at this point.
But, if you then "migrated" that instance of Win 7/8/8.1 to a different machine, you would have two machines running with the same license -- again, not legal.