The main issue seems to be that Windows security features detect UnrealEditor-NGXVulkanRHIPreInit.dll as an unsigned DLL (NotSigned) and prevent it from loading.
Checking around the community, that error log you are getting, 0xc0000092, is indeed pointing at a DLL conflict, most likely due missing a signature, or having invalid parameters. There are a few things to test for this scenario, let’s go one by one:
First of all, sounds trivial, but make sure that your system clock and timezone are correct, as .dll/signature issues can be triggered by such a difference
Second, try re-downloading the DLSS plugin files directly from nVidia, then overwrite the contens in your Binaries folder
Double-check the DLL you are using, by right clicking it, picking Properties, and checking the Digital Signatures tab, there should be a validation entry present
If all files are valid, yet the issue remains, I would test by temporary disabling Win11’s app control, which has quite a few cases about blocking valid files. To do so, search for “Smart App Control” in Windows Home menu, open it, and set it to Off
