You could try performing a repair with the Windows ISO. See this: https://answers.microsoft.com/en-us/windows/forum/windows_10-windows_install-winpc/how-to-perform-a-...
If you can get a Command Prompt as Administrator you could try the System File Checker by typing "sfc /scannow".
If the sfc /scannow doen't solve the issue, in powershell as admin try running DISM /Online /Cleanup-Image /RestoreHealth
Forum Member since 2004
I am not a Dell employee
I am not sure what you mean by converting your USB to a recovery drive. You should have used the Media Creation Tool along with the Windows 10 ISO to create Windows 10 installation media on the USB drive. With the Windows 10 installation drive you should have done a repair install after selecting the option to keep personal files and apps.
A system restore does a restore to a saved restore point. Sometimes updates create restore points or you can create your own restore points prior to installing apps, new drivers, etc.
A system image recovery would only work if you had previously created and save a system image.
I would go back and try the repair install with the USB drive.
Have you tried booting to safe mode? May be able to get to system restore that way.