Windows 10 stuck in endless reboot restart loop or no boot or BSOD

FRENCH VERSION

Some update failed, now the computer is in an endless reboot loop …

SauveMonPC  will help you.

Specific case: BSOD BAD_CONFIG_INFO : go directly to step 4

DO NOT REINITIALIZE your computer, or you will loose applications and settings.

 

1/ Hard disk mode
Enter the BIOS (See your pc user manual or google for bios followed by your full pc model) and find « SATA CONFIGURATION »
Change option between IDE / AHCI / RAID.
If the system is unable to boot on any option, go to solution 2/
If the system boots on one option, it means that the BIOS lost the correct option: verify computer’s time and date.
If time and date are not good, the bios backup battery (often a CR 2032) is to be replaced: see documentation.

2/ Try to reach system repair
As you are in a loop, it’s not easy.
If the computer won’t let you reach repair screen, turn off the computer during the boot sceen, by holding down the power button, till shutdown, then restart … 3 times
The Windows logo with a line about repair will appear: now, let it boot.

Sometimes, it is really impossible to reach repair mode, in this case

  • open BIOS (see user manual, the most often tap F2 or F9 or F10 or ESC during boot)
  • set boot first device on USB or DVD depending on the device you have
  • insert installation/repair DVD or USB (if you don’t have one, see here)
  • save changes and exit > you now boot on the repair support d’installation, it will take some minutes
  • On install screen DON’T INSTALL, select repair this PC bottom left
  • Go to step 2

3/ verify HDD
Select advanced options
resolution_problemes_windows_10
then Command line
When the command line is here, we will have to find windows
Enter C:
Enter DIR
In the displayed list, see if Windows is listed.
If not, continue with D: E: F: …. followed by DIR each time to find the Windows drive.
Remember the letter
Enter X:
Now enter: CHKDSK /F C: ou CHKDSK /F [the lettre you found]: for example CHKDSK /F F:
At the end of the check enter EXIT
Try normal boot (remove usb or dvd, power off , power on).
If the system is not repaired, do all the same except the command CHKDSK /F /R [the letter you found]: for example CHKDSK /F /R C:
Reboot, if no change go to step 4

4/ back to previous version
Repeat previous operations to reach repair options,  now select System restore
options-recuperation-avancee_windows-10
If you have restoration points, select one before the loop occured
Launch, wait, and then finish here

If you don’t have any restore point, select Go back to previous version.
Launch, wait, and then finish here

If the system is still not working, try step 5.

5/ Restore last working configuration

– Use installation/repair support, if you dont’t have one Google for « Windows Media Creation Tool » and follow instructions to create one
– Boot on this support, go ahead language selection, DON’T INSTALL, select « repair this PC »
– you may follow the text herafter or follow this tutorial.
– Select advanced options > command line

When you get the X:\, enter the following commands to turn off the system registry

CD C:\Windows\System32\config
ren DEFAULT DEFAULT.old
ren SAM SAM.old
ren SECURITY SECURITY.old
ren SOFTWARE SOFTWARE.old
ren SYSTEM SYSTEM.old

Now rewind to the previous working registry with the following commands

CD RegBack
system must show: C:\Windows\System32\config\RegBack\

now copy all the registry, command:

copy *.* ..

System must display 5 files copied.
If it does not, do it again, be careful to type the exact syntax

Now type EXIT, then « quit and go to Windows », or restart.

If the issue is not fixed, recover the registry by booting again on the installation/repair support, go back to command line and enter the commands

CD C:\Windows\System32\config
del DEFAULT
del SAM
del SECURITY
del SOFTWARE
del SYSTEM

ren DEFAULT.old DEFAULT
ren SAM.old SAM
ren SECURITY.old SECURITY
ren SOFTWARE.old SOFTWARE
ren SYSTEM.old SYSTEM

6/ Restore boot following  these instructions