Desktop

If you suspect software, as you say, that's easy to determine. Go back to your latest image backup or factory conditions, or do a clean install of Windows. If you don't want to risk damaging the current data on your SSD, use a new one for this test.

The PSU looks somewhat light for this set of hardware. But that's part of "buy new parts".

Can you post a link to your a speccy? See https://www.ccleaner.com/docs/speccy/using-speccy/publishing-a-speccy-profile-to-the-web . It might show something suspect.

When you run the userbenchmark just post a link to the results page.....makes it easier to read.

Do run speccy free.
https://www.ccleaner.com/speccy/download

Then post a link as noted in an above post.