Windows 10: Is it possible to repair corrupt or missing startup files without ever logging into the...

Hello :TLDRell laptop is stuck in boot loop and won't boot into recovery mode when using a recovery drive or by normal means and I can't login.Long Version:A while ago a Dell laptop of mine mysteriously crashed one morning when I went to turn it on, and it became stuck in a boot loop, where it would attempt to start Windows, and the loading screen would appear, but then it would crash and this would repeat. On occasion it would attempt to enter Windows recovery mode after detecting 3 consecutive failed boots but that would also crash.I looked up how I could repair it without actually logg

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Corrupted file RAR

If the archive has been created using WinRAR, why don't you try WinRAR itself? It has a built-in repair feature for repairing corrupted archive (ZIP as well as RAR). Follow the steps given below:

• Open WinRAR application in your system.
• Now click on File tab > Open or simply press Ctrl+O.
• A small window "Find Archive" will pop up. Locate the corrupt RAR archive from your system directory and select it.
• Now click Open button.
• Click Tools tab > Repair archive or simply press Alt+R.
• Again a small window "Repairing File name.rar" will pop up.
• Now click Browse to select a location to save the repaired archive.
• Check the box "Treat the corrupt archive as RAR" and click OK.
• WinRAR will start repairing of corrupt RAR archive. Once it gets completed click Close.

I hope the above steps will help you repair the corrupted RAR archive.

Thanks.

 

Understanding the CBS log & repairing corrupt files

I've been getting some event errors lately, in particular 2 errors.

Date: 10/21/2019 8:54:17 AM
Type: ErrorEvent: 1020Source: Microsoft-Windows-Perflib

The required buffer size is greater than the buffer size passed to the Collect function of the "C:\Windows\System32\perfts.dll" Extensible Counter DLL for the "LSM" service. The given buffer size was 34008 and the required size was 45368.

Date: 10/21/2019 2:07:45 PM
Type: WarningEvent: 1008Source: Microsoft-Windows-Perflib

The Open procedure for service ".NETFramework" in DLL "C:\WINDOWS\system32\mscoree.dll" failed with error code The system cannot find the file specified.. Performance data for this service will not be available.

So I went to https://support.microsoft.com/en-us/...rrupted-system and ran

sfc /scannow

I got the message:
Windows Resource Protection found corrupt files but was unable to fix some of them.For online repairs, details are included in the CBS log file located at windir\Logs\CBS\CBS.log.

I tried to follow the rest of the steps listed on the support page, but got lost in the details.

1. When I used an elevated Powershell & ran the suggested command, I got:

PS C:\> findstr /c:"[SR]" %windir%\Logs\CBS\CBS.log >"%userprofile%\Desktop\sfcdetails.txt"

out-file : Could not find a part of the path 'C:\%userprofile%\Desktop\sfcdetails.txt'.At line:1 char:1+ findstr /c:"[SR]" %windir%\Logs\CBS\CBS.log >"%userprofile%\Desktop\s ...+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : OpenError: ) [Out-File], DirectoryNotFoundException + FullyQualifiedErrorId : FileOpenFailure,Microsoft.PowerShell.Commands.OutFileCommand

2. I manually went to C:\Windows\Logs\CBS & opened CBS.log.There was so much detail that I couldn't follow what was corrupt. I've attached the log.

I would appreciate anyone telling me what files are corrupt & how to replace them. Thank you in advance!

 

Startup repair not working after "Default boot device missing" message

Hi Adam,

Corrupted boot system files is one possible cause why you're getting an error message after running the startup repair. Before we proceed, I'd like to know if you have made any changes prior to the issue.

Meanwhile, I would suggest that you boot from Windows 10 installation media in a removable storage device, flash drive, or DVD and access the Advanced option. To do this, follow the steps:

• Insert the USB or flash drive to your PC and restart.
• The Windows Setup screen will pop-up, select language and click Next.
• Choose Repair your computer.
• Select Troubleshoot.
• Click on Advanced options.
• Choose Command Prompt and enter the following commands:

bootrec /scanos

bootrec /fixMBR

bootrec /fixBoot

bootrec /rebuildBCD

• Restart PC and check if there are any changes.

Update us with the results.