Not sure if this is a virus, infection or whatnot

I am not sure if my issue is virus or operating system related, or whatever it is. Since my symptoms are based upon protection software, I posted here. My post details the only symptoms I've seen.

My computer was running normally this morning, usual browsing through the same sites, until I noticed the AVG icon in my taskbar was gray, claiming my definitions were out of date. When I went to update the virus definitions, the update process claimed I was up to date, yet the icon stayed gray. A full scan with AVG claims no threats found.

Windows Defender also claims I need to check for new definitions, although I ran that the other day. When I try to update Defender, I get Error found: 0x80072f8f. I went to the Windows site and downloaded an update, ran it and still get the same error.

Ad-aware Personal SE won't update as well and claims my definitions are 114 days old, although that is not the case and not even close to accurate.

Spybot -- Search & Destroy won't update due to a bad checksum on downloading the updates.

I update the definitions on all of these programs almost every day, at least once a week and sometimes more often. I run each scan at least once a week as well. Basically, I cannot update my protection software and thus cannot trust the scans. Other than these symptoms, which I consider serious and not isolated, my machine is running normally. What can I do to find out what is wrong and what is the next step? Do I need go through the Read Me & Run me First steps, even though I am not certain this is an infection?

 

After I posted, I did find the calendar was on the wrong date. That is most probably because I was using it earlier in the day, though I don't remember clicking "Apply" instead of "Close." Once I reset the date and time, all the programs updated properly. None of the scans I ran yesterday showed and threat present. I think I should be all clear, yet I'll monitor the computer and post logs if needed. Thank you.