Unable to perform any Windows updates on desktop PC that was originally Vista, upgraded to Windows 7

I am unable to perform any Windows updates on a Gateway desktop PC that was originally Vista, upgraded to Windows 7. I'm getting error codes 8024401C, 8024A000, and 800706BA. Already tried shutting off Windows Defender and Windows Firewall -- it helped -- sometimes

listed 31 updates I need, but won't download ANY.

It may help you to know a couple of things about this PC -

It has an added NVidia video card - a GEForce 6200 (this has all current updates)

After I installed Windows 8, I accidentally installed Norton 360 (before I realized it didn't run on Windows 8). I then uninstalled it, but who knows, maybe there are remnants of it left on the system. Also, there was an expired version of Norton on the

PC when I installed Windows 8 which I also removed later.

Windows 8 seems to be very unstable -- for example if I try to run Internet Explorer from the home screen from the "Charms" it ALWAYS CRASHES/RESTARTS THE PC. Yet if I run it from my old desktop -- it runs with no problem. Very strange.....

I really need these Windows Updates. HELP!!

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