how to fix the computer when the blue screen appears

Post actualizado el día September 27, 2026 by DeiviSanzPlay

PC Won’t Start? Discover How to Fix Windows STARTUP ERROR with Safe Mode, Startup Repair, and System Restore. IMMEDIATE SOLUTION!

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Safe Mode is, without a doubt, the most valuable tool when your PC has problems. When you start in this mode, Windows loads only the minimum essential drivers and services. If the computer starts correctly in Safe Mode, you’ll instantly know that the likely cause of the problem is faulty drivers, conflicting software at startup, or some malicious program.

To access it, you normally need to interrupt the boot process three times in a row. This forces Windows 10 or Windows 11 to automatically enter the&nbsp;<a href="https://www.chusmeando.com/informatica-y-tecnologia/windows-en-ingles-aprende-a-cambiar-a-espanol-en-1-minuto-sin-reiniciar-guia-paso-a-paso-para-windows-10-11-12/” title=”Cambia Windows a Español en 1 Minuto”>Windows Recovery Environment (WinRE). Once there, navigate to Advanced options > Startup Settings > Restart. After the restart, you’ll be presented with several options; press the F4, F5, or F6 key to choose the type of Safe Mode you want.

Once on the desktop, which will appear with a basic resolution, you can start fixing the problem. Uninstall any software that was installed right before the problems began. Use Device Manager to roll back or update drivers, especially graphics card ones. You can also run a full scan with your antivirus or use Microsoft’s malware removal tool, Malicious Software Removal Tool.

If the problem is resolved in Safe Mode, you can restart normally. Often, the act of uninstalling the conflicting item from this environment is enough to restore normal startup. It’s a crucial first step that saves hours of work.

Using Windows Startup Repair to troubleshoot problems

If Safe Mode isn’t enough or you can’t access it, the next line of defense is the automatic Startup Repair tool. This built-in utility is specifically designed to scan for and correct common problems that prevent Windows from loading, such as damaged or missing boot files or incorrect Boot Configuration Data (BCD) settings.

To run it, you need to reach the Windows Recovery Environment (WinRE) using the interrupt-boot method or, preferably, via a USB recovery drive. Creating a recovery drive on another PC is a smart practice we should all adopt. Official instructions for creating one are available on the Microsoft Support site.

Once in WinRE, go to Advanced options and select Startup Repair. The tool will begin analyzing your system automatically. This process can take several minutes. If it finds a problem, it will try to fix it and inform you of the result.

It’s important to keep in mind that Startup Repair is not a magic bullet. It’s excellent for specific boot file problems, but it may not resolve deeper operating system issues or hardware failures. If the tool can’t repair the problem or if your PC enters a loop trying to repair itself, it will be time to move on to more robust methods, such as system restore or rescanning the system image.

Restore the system to a previous point to recover stability

This is one of the most effective solutions when you’re sure that the error was caused by a recent software change. System Restore allows you to revert your computer’s configuration, drivers, and Windows registry to a previous known-good state, called a “restore point.” The crucial thing is that your personal files, such as documents, photos, and emails, are not affected.

To use this feature, you must access the Windows Recovery Environment (WinRE) again. From there, go to Advanced options > System Restore. The tool will launch and show you a list of available restore points, along with the date and time they were created. Try to choose the most recent point before the date the problems began.

The restoration process takes a while and will restart the computer. It’s essential not to interrupt this process. Once finished, Windows should start normally. For this option to be available, system protection must have been previously enabled. You can verify this and create restore points manually at any time from the system properties on a PC that’s working properly. It’s a preventive measure worth its weight in gold.

Recover the system using SFC and DISM to repair damaged files

If Windows manages to start but is unstable, or if you can access the Command Prompt from Safe Mode or WinRE, two powerful commands can save your system: SFC and DISM. The System File Checker (SFC) is a utility that automatically scans for and replaces corrupted, missing, or modified versions of protected system files with the correct cached versions.

To use it, open the Command Prompt (cmd) or PowerShell as administrator and type the command sfc /scannow. Let the process complete, which can take up to an hour. If it finds corruption and can’t repair it, it’s time to use DISM.

DISM (Deployment Image Servicing and Management) is a deeper tool that repairs the Windows image (the WIM file) that SFC uses as a source for its repairs. Run DISM /Online /Cleanup-Image /RestoreHealth in a terminal with admin privileges. This command will download the necessary files from Windows Update to fix any underlying corruption. Microsoft’s official documentation on using DISM can be found here.

It’s common to run DISM first and then run SFC again for a complete repair. These commands are a shock treatment for a wounded operating system and often resolve random errors and performance issues that originate from system file corruption.

Rebuild the BCD and master boot record for critical errors

When you’re faced with specific error messages like “Boot file missing” or “Operating system not found,” the problem almost always lies in the Master Boot Record (MBR) or in the Boot Configuration Data (BCD). These are small but critical components that tell your computer’s BIOS/UEFI where to find the operating system to boot it.

Fortunately, we can rebuild them manually using the Command Prompt from WinRE. Here are the general steps:

1. In WinRE, go to Advanced options > Command Prompt.
2. Type bootrec /scanos to allow the tool to scan all disks for Windows installations.
3. Then, type bootrec /rebuildbcd. If it finds an installation, accept adding it to the BCD.
4. If that doesn’t work, you can force a complete rebuild with these sequential commands:
   • bootrec /fixmbr (Writes a new MBR)
   • bootrec /fixboot (Writes a new partition boot sector)
   • bootrec /rebuildbcd (Rebuilds the BCD)

In very stubborn cases, you may need to back up and completely delete the existing BCD file before rebuilding it. Microsoft’s Bootrec reference guide, although a bit old, is still mostly valid and is available in its documentation. This method is technical, but it is incredibly effective for specific boot errors.

How to reinstall Windows without losing your files

When everything else fails, reinstalling is the final option. But this no longer necessarily means deleting all your data. Windows 10 and 11 offer a fantastic feature called “Reset this PC”. This option lets you choose between keeping your personal files or deleting everything, reinstalling Windows fresh in the process.

You can access this tool from WinRE by going to Advanced options > Reset this PC. Then, select Keep my files. The process will remove all the applications and programs you have installed (so be prepared to reinstall them later) and revert the settings to their default values, but your documents, pictures, music, and other personal data will remain intact in the user folder.

It is a way to start over with a clean installation of Windows without the hassle of making full manual backups and recreating all your settings from scratch. Of course, it is always advisable to have a backup of your most important data on an external hard drive or in the cloud before performing any operation of this caliber, just in case. Microsoft routinely recommends this method for persistent system problems.