Windows Startup and Boot Repair Guide (Windows 10 and Windows 11)

Fix Windows When It Will Not Start Properly

Startup and boot problems are among the most stressful Windows issues. Symptoms include endless restart loops, being stuck on a loading screen, or seeing errors such as "Operating System Not Found."

This guide provides safe, step-by-step repair methods for Windows 10 and Windows 11, starting with the least invasive fixes.

Step 1: Disconnect External Devices

External devices can interfere with boot.

1. Power off the computer

2. Disconnect USB drives, printers, and external hard drives

3. Power the system back on

Step 2: Use Automatic Startup Repair

1. Hold Shift and click Restart

2. Go to Troubleshoot > Advanced options > Startup Repair

3. Select your Windows account and wait for repair to complete

Step 3: Boot into Safe Mode

Safe Mode loads minimal drivers.

1. Enter Advanced options

2. Select Startup Settings > Restart

3. Press 4 for Safe Mode

If Windows starts in Safe Mode, uninstall recent drivers or software.

Step 4: Uninstall Recent Updates

1. Go to Advanced options > Uninstall Updates

2. Remove the latest quality update

3. Restart normally

Step 5: Repair System Files

1. Open Command Prompt from Advanced options

2. Run:
   sfc /scannow

3. Restart after completion

Step 6: Rebuild Boot Configuration

1. Open Command Prompt (Advanced options)

2. Run:
   bootrec /fixmbr
   bootrec /fixboot
   bootrec /rebuildbcd

When Boot Problems Persist

• Test the system drive for failure

• Back up data immediately

• Consider reinstalling Windows

Return to the Top 50 Windows Computer Problems hub for additional troubleshooting.