Windows 10: Windows not loading after Update

Last night I have installed the cumulative update for windows 10, 2004 after which my computer is stuck at startup screen. Pls help !

:)

 

Why did the startup window get cleared?

I didn't missed any step, the list was gone and gone , even after using lot of programs the programs were not listed in that list.

 

Windows wont load after installation

I just purchased a Sony Vaio PCG-71912L laptop from Craigslist. Before completing the transaction, I made sure it could boot into the pre-installed Windows, check the RAM, and HD size. Everything seem normal. However, I wanted a clean install of Windows. Windows installs fine, no issues. After going through the steps of making a user-name, setting up the time zone, and configuring updates, it prepares the desktop and does the final reboot. This is where the problem comes in. It goes through the BIOS check, after the splash screen it tries to load Windows (white blinking cursor), then the laptop recycles to the BIOS again. It will continue this process until I turn it off. I can reinstall, but the process will happen all over again. One thing that struck me as bizarre; there's no 100MB system partition. What can I do??

System Specs:

Intel Pentium 2.0 GHZ
4GB RAM
500 GB HDD

 

MSI 5870 BIOS Update

Still can't reproduce. Could you please post the exact BIOSes that produce the issue?