...or days to scan and find those updates. You're not alone here as we've had a few folks with similar problems. In most cases, after they let the machine scan for a couple of days, eventually the machine found the updates. Most feel it's because Microsoft may have transferred most of their bandwidth/resources to the new Windows 10, therefore previous versions of Windows are suffering. Also, if you're referring to Windows Defender definition updates, they also come from the standard Windows Updates process. It's all part of the same scanning process.
At this point, keep on trying and let it search longer.
Hope this helps.
I have Windows 7 and an Acer Aspire laptop. Recently I have been unable to download windows updates because it just continues to search for updates and never stops. I ran the update troubleshooter and it said that it was fixed, but it is not. Also, and I don't know if the problems are related, I can no longer update my Microsoft Security Essentials virus and spyware definitions. Thanks for any help and please keep it basic for me.