That's a surprise, I didn't even know that AMD offers some kind of CPU drivers That said I just downloaded chipset drivers from here and manually injected USB3 driver into my Windows 7 iso - only reason it can't be installed on Ryzen and newer Intel series is because it lacks these drivers.
Alright but I'm not complaining about this cpu performance, it actually performs really good. I'm complaining about RX 590 issue, and this GPU is officially supported on Windows 7. Also OP is running Windows 10 and experiences the same problem. My brother was running GTX 1050 in this setup for over half a year and it just worked, older AMD driver works well too. This is clearly an issue with newer GPU drivers and this is not a first time AMD breaks something such trivial.
I think the only way you can report this problem and get any support from AMD to fix it is to get a new hard drive and do a quick installation of Windows 10 64bit and then see if you can repeat your problem with the RX590 and your Ryzen processor.
Then if you still see the problem, report it here, submit an AMD Reporting form and then open an email support case with AMD.
I saw the following article some time ago about running Ryzen with Windows 7: How To Get Ryzen Working on Windows 7 x64
Not much time left for Windows 7 Users now:
End of extended support = January 14 2020.
So you will be on Windows 10 soon enough, unless you decide to try for freedom and move to running: Download Ubuntu Desktop | Download | Ubuntu
Now this is interesting; I have noticed this happen intermittently but didn't think anything of it at the time. Additionally, I have found that in driver versions 18.12.2 through 19.2.1 that enabling Freesync causes screen tearing and motion judder in video playback. Does this happen with you also? Freesync works fine in games, it only manifests in video playback through something like MPC-BE, MPC-HC or the built-in player on Windows 10.
The last driver to not have these problems is 184.108.40.206, just before the new Relive features rolled out.
Surely I'll switch to something more modern in the near future, however the issue just got fixed with 19.2.2 driver so everything is fine right now.