The latest AMD chipset drivers that are included with the newer Win 8/10 64 bit compatible AMD Graphics drivers do not get along with Win 7. The last Working Win 7 64 bit chipset driver is version 18.10.0830 which was released 9/4/2018. Your AMD 2.0.0.0048 driver was released in 12/11/17.
Go here and select "Chipsets" then select "AMD 9-Series Chipsets" and "990FX" and "Submit". Scroll down and select the Win 7 64 bit driver which is 18.10.0830 File Size 65.4 MB Release Date 9/4/2018
This is the last official working chipset driver for AMD boards in Win 7 64 bit.
https://www.amd.com/en/support
If that doesn't fix it You might have to use DDU to remove all traces of the old AMD, Nvidia and/or Intel drivers. It has the ability to delete all traces of any AMD, Nvidia or Intel drivers. Then you can restart and reinstall your Chipset drivers and graphics drivers. I would just install the latest one that your Motherboard Manufacturer has listed on there site. It will work and that is all that you need. DDU is an Awesome program for getting rid of AMD, Nvidia and Intel drivers. I've used it quite a few times especially on Laptops. https://www.guru3d.com/files-get/display-driver-uninstaller-download,19.html
Win 7 hasn't been officially supported for a couple of years now and the newer drivers will still install on it which can fuck it up pretty good. You can still upgrade to Win 10 64 for free if you have a legit copy of Win 7 or win 8. It's a POS OS but it works.