How to Fix the Blue Screen of Death (BSOD) on Windows

What Is a Blue Screen of Death?

A Blue Screen of Death (BSOD), officially called a Stop Error, occurs when Windows encounters a critical error it can't recover from. The system halts to prevent damage, displays a blue screen with an error code, and restarts. While terrifying, a BSOD is Windows' way of protecting itself — and the underlying cause is almost always identifiable and fixable.

Step 1: Read the Error Code

Modern Windows BSODs (Windows 10 and 11) display a QR code and a plain-English error description. The most important piece of information is the stop code, such as:

• CRITICAL_PROCESS_DIED — A core Windows process crashed.
• MEMORY_MANAGEMENT — A RAM-related issue.
• DRIVER_IRQL_NOT_LESS_OR_EQUAL — A faulty or outdated driver.
• NTFS_FILE_SYSTEM — Hard drive or file system corruption.
• KERNEL_SECURITY_CHECK_FAILURE — Corrupt system files or hardware failure.

Write down or photograph the stop code before the PC restarts — it's your roadmap to the fix.

Step 2: Check What Changed Recently

BSODs are often triggered by a recent change. Ask yourself:

• Did you install a new driver or Windows update?
• Did you add new hardware (RAM, GPU, external drive)?
• Did you install new software?

If yes, reversing that change is your first move. Use System Restore (search for it in the Start menu) to roll back to a point before the BSOD started.

Step 3: Update or Roll Back Drivers

Faulty drivers are the #1 cause of BSODs. GPU drivers in particular are frequent offenders after updates.

1. Right-click Start → Device Manager.
2. Look for any devices with a yellow warning triangle.
3. Right-click the device and choose Update driver or Roll Back Driver if a recent update caused the issue.

Step 4: Run Windows Memory Diagnostic

Faulty RAM causes a wide range of BSODs. Test yours with the built-in tool:

1. Search for Windows Memory Diagnostic and open it.
2. Choose Restart now and check for problems.
3. The test runs on next boot and reports any errors.

Step 5: Check Your Hard Drive for Errors

Disk corruption or a failing drive can trigger BSODs. Run CHKDSK from the Command Prompt (as Administrator):

chkdsk C: /f /r

You'll be prompted to schedule the scan on next restart. Let it run — it can take 30–60 minutes on large drives.

Step 6: Run System File Checker (SFC)

Corrupted Windows system files are another common BSOD cause. Open Command Prompt as Administrator and run:

sfc /scannow

SFC will scan and automatically repair any corrupted system files it finds. Follow it up with:

DISM /Online /Cleanup-Image /RestoreHealth

Step 7: Check for Overheating

Thermal throttling and overheating cause sudden shutdowns and BSODs. Download a free tool like HWMonitor or Core Temp to check CPU and GPU temperatures. A CPU running consistently above 90°C under load is a problem — clean the cooling vents, reapply thermal paste if needed, or check that fans are spinning.

When to Seek Professional Help

If BSODs persist after all software-level fixes, the issue may be hardware: failing RAM, a dying hard drive, or a damaged motherboard. A local repair shop can run hardware diagnostics. If your PC is under warranty, contact the manufacturer.

BSOD Fix Summary

Stop Code	Most Likely Cause	Best Fix
DRIVER_IRQL...	Bad driver	Update/roll back driver
MEMORY_MANAGEMENT	Faulty RAM	Memory Diagnostic
NTFS_FILE_SYSTEM	Disk corruption	CHKDSK
CRITICAL_PROCESS_DIED	Corrupt system files	SFC / DISM
KERNEL_SECURITY_CHECK	Hardware/software conflict	System Restore

Don't panic at the blue screen — read the error code, follow the steps above, and you'll resolve the vast majority of BSOD issues without professional help.