So if I try downloading any nVidia, EVGA or other update type file Windows blocks the file. I tell it to execute anyways and I get invalid file error of some type. In the z390 bios file I just downloaded, in file manager it says its 13,788 KB in the zip, but windows says there are no files within it to extract. If I use my windows surface tablet to download these files, then transfer them to my PC, they will run and install normal. If I use the z390 system to download an app or program, they work directly; even one I just did that was 1.4 GB. 
  Was thinking mem was running too fast, put things back to factory speeds and it did not change. Using Chrome or Edge browser does not matter. Even killed System Mechanic with no help. Still trying to figure out is it hardware or software? Just seems so strange it's an update type only.

Malwarebytes found nothing and Deep scan with System Mechanic found some minor adware on a backup drive, but nothing that would cause this problem. Thinking now the last windows update may have installed improperly. Using a different ethernet port did not change things so must me windows related.
 Update: well none of that changed anything. I once again downloaded the latest nvidia driver on my tablet and copied to the PC. It runs as normal. So I compared the 2 downloaded files and they are identical in every way. Will try the original file on my tablet just to see if it will expand. I got the same error Non 7Z on my tablet so it has to be corrupting in the way it downloads somehow. Used Edge with no change. I guess its back to playing with the memory settings.
 
Well setting ram to AUTO still not helping, always getting this: