Lenovo laptop won't boot

Mike,
We appreciate your efforts in trying to fix the issue, we apologize for the difficulties. We suggest you to reboot your device in safe mode http://avgclick.me/rebootintosafemode and check for the result. Let us know if you face any difficulties, thank you!

My Lenovo laptop (running AVG Free + Win 10) crashed and won't reboot. I created and launched an AVG Rescue CD, I re-named any AVG driver files found in /sda1/Windows/System32/drivers as explained on the page | AVG, but on re-boot, Windows fails with a message "The operating system couldn't be loaded because a critical system driver is missing or contains errors"  File:\WINDOWS\system32\DRIVERS\avgboota.sys Eorror Code: 0xc000000f.

I'm not able to get the laptop to display the boot into Safe Mode (or any boot option) via F8… It just drops straight into saying "Preparing Auto Repair", then a blue screen with the message I originally posted. There is a menu under F8 for Safe Mode on the blue screen, but selecting it just results in immediately going back to square one, and not re-booting…

Hello Mike,
In this case have you tried to repair your Windows installation? If not please have a look at this link http://answers.microsoft.com/en-us/windows/forum/windows8_1-update/error-code-0xc000000f-file/398ea82e-fe21-425e-8d2f-a2d0c1e40d56 and  continue with the suggested steps to repair your Windows PC.
Thank you.