Inspiron

[PSwati]

Sir my system is Inspiron 15 3000 series, my windows 10 screen stuck on welcome login page and cursor continuously processing. Even Supportassistant os recovery shows OS_boot_failure and repair fails on 20% , startup repair gives log as DMAlertlistener.proxystub.dll not proper 

What possible measures should I take?

[ejn63 · Accepted solution]

If that's the case, and the repair fails, it's time to reload Windows.

https://www.dell.com/support/article/en-us/sln297920/reset-or-reinstall-windows-10-on-your-dell-comp...

[PSwati]

No , hardware diagnostic run successful

[ejn63]

Boot to the Dell diagnostics (F12 at powerup).  Run an extended diagnostic on the hard drive, which I suspect you will find has failed.