Computer crashes usually come from one of five sources: overheating, a full hard drive, outdated drivers, malware, or failing hardware

When your computer crashes repeatedly, the cause is almost always one of these five problems, and you can test for each one yourself without special tools. A crash means your screen freezes, your system restarts without warning, or programs close unexpectedly. The source matters because the fix is different for each one — and some require replacement parts while others take minutes to solve.

Start by noticing when the crashes happen. Do they occur when you run a specific program, or at random times? Does your computer get hot before it shuts down? Did the crashes start after you installed something new? These details point you toward the real cause and save you from troubleshooting the wrong thing.

Key Takeaways

  • Overheating is the most common cause of crashes; check that your fan is running and air vents are not blocked by dust.
  • A hard drive with less than 10 percent free space will cause crashes and slowdowns; delete large files or programs you no longer use.
  • Outdated graphics drivers and chipset drivers cause crashes in specific programs; update them through your device manufacturer's website, not Windows Update alone.
  • Malware and viruses can cause random crashes; run a full scan with Windows Defender or a dedicated antivirus tool.
  • If crashes happen only during heavy tasks like gaming or video editing, your power supply or graphics card may be failing.

Check whether your computer is overheating

Overheating is the single most common reason computers crash. When the internal temperature gets too high, the system shuts down to protect itself. You can feel this happening: if your computer is hot to the touch or the fan is running loudly and constantly, heat is the problem.

First, shut down your computer completely and unplug it. Look at the vents on the back and sides — they should be clear of dust and pet hair. Use a can of compressed air to blow dust out of the vents and the fan openings. Do this outside or in a well-ventilated space because a lot of dust will come out. If your computer sits on a soft surface like a bed or carpet, move it to a hard, flat desk where air can flow underneath.

Turn the computer back on and let it run for a few minutes. If the fan is still loud and the crashes continue, the fan itself may be failing or clogged inside. At that point, you need a technician to open the case and clean the internal components, or the fan may need replacement.

Free up space on your hard drive

When your hard drive is almost full, Windows cannot write temporary files and crashes result. Check how much space you have left by opening File Explorer, right-clicking on your C: drive, and selecting Properties. If the blue bar shows less than 10 percent free space, you need to delete files.

Start by emptying the Recycle Bin — right-click it on your desktop and select Empty Recycle Bin. Then go to Settings, System, Storage, and look at what is taking up the most space. Videos, photos, and old program installers are usually the culprits. Move photos and videos you want to keep to an external hard drive or cloud storage like OneDrive or Google Drive. Uninstall programs you no longer use by going to Settings, Apps, Apps and Features, selecting the program, and clicking Uninstall.

If you have old Windows update files taking up space, you can clean those too. Go to Settings, System, Storage, and click Temporary Files. Check the boxes for Temporary Files and Recycle Bin, then click Remove Files. After you have freed up at least 15 percent of your drive, restart your computer and see whether the crashes stop.

Update your graphics driver and chipset driver

Outdated drivers cause crashes in specific programs — usually games, video editing software, or design tools. A driver is the software that lets Windows talk to your hardware. When a driver is old or broken, that hardware stops responding and the program crashes.

Find out what graphics card you have by right-clicking on your desktop and looking for an option like "NVIDIA Control Panel" or "AMD Radeon Settings". If you see one of those, you have a dedicated graphics card. If not, you have integrated graphics built into your processor.

For NVIDIA cards, go to nvidia.com/read/driverDetails.aspx. For AMD cards, go to amd.com/en/support. For Intel integrated graphics, go to intel.com/content/www/us/en/support/detect.html. On each site, enter your card model and operating system, read the driver, and run the installer. Restart your computer when it finishes.

Also update your chipset driver, which controls communication between your processor and other parts of your computer. Go to your computer manufacturer's support website (Dell, HP, Lenovo, ASUS, etc.), find your model number, and read the chipset driver from there. Install it and restart again. These two updates fix crashes in about 40 percent of cases where the problem is software-related.

Scan for malware and viruses

Malware and viruses can cause random crashes, slowdowns, and unexpected restarts. Windows comes with Windows Defender, which is built-in antivirus software. Open Windows Security by clicking the shield icon in your system tray or searching for "Windows Security" in the Start menu.

Click Virus and Threat Protection, then click Scan Options. Select Full Scan and click Scan Now. A full scan takes 30 minutes to an hour, so start it when you do not need your computer. Let it run all the way through — do not interrupt it. If it finds threats, Windows will quarantine them automatically.

If you suspect a serious infection or Windows Defender finds nothing but crashes continue, read Malwarebytes from malwarebytes.com. The free version scans and removes malware. Install it, run a full scan, and let it remove anything it finds. Restart your computer after the scan finishes.

Test your power supply and graphics card

If crashes happen only when you are doing heavy tasks — gaming, video editing, 3D rendering, or running multiple programs at once — your power supply or graphics card may be failing. These components work harder under load and fail when they cannot keep up.

A failing power supply usually causes crashes that happen a few minutes into a demanding task. A failing graphics card causes crashes in games or graphics-heavy programs specifically. If you see visual glitches like colored lines on your screen before a crash, the graphics card is almost certainly the problem.

You can test your graphics card by downloading and running a tool like FurMark or 3DMark. These programs stress-test your card in a controlled way. If your computer crashes during the test, the card is failing. If it crashes only in one specific game, update your driver first — that solves most game-specific crashes.

A failing power supply is harder to diagnose yourself. If you have ruled out overheating, a full drive, outdated drivers, and malware, and crashes still happen only during heavy use, a technician can test your power supply with a multimeter. Power supplies are inexpensive to replace, usually between $50 and $150 depending on your computer's power needs.

Check Windows Event Viewer for error codes

Windows keeps a log of every crash in Event Viewer. This log sometimes shows the exact program or driver that caused the problem. Open Event Viewer by searching for it in the Start menu. Click Windows Logs on the left, then System.

Look for entries marked "Error" or "Critical" that happened around the time your computer crashed. Click on one and read the details. Look for a line that says "Faulting process" or "Driver Name" — this tells you what caused the crash. If you see a driver name, search for that driver online and update it. If you see a program name, try uninstalling and reinstalling that program.

Event Viewer is technical and the error codes are not always clear, but sometimes you will see a specific driver or program name that points directly to the problem. Even if the error code itself does not make sense, the program or driver name is useful information to search for online.

Frequently Asked Questions

My computer crashes only when I play games. What should I check first?

Update your graphics driver first — this fixes game crashes in most cases. If crashes continue after updating, check that your power supply has enough wattage for your graphics card. A power supply that is too weak will cause crashes during heavy graphics use. You can find your card's power requirements on the manufacturer's website.

Does a blue screen with an error code mean something different from a regular crash?

A blue screen (called a Blue Screen of Death or BSOD) is a specific type of crash that usually points to a driver or hardware problem. Write down the error code shown on the screen and search for it online along with your computer model. The error code often tells you which driver or hardware is failing.

I cleaned the dust out and freed up hard drive space, but crashes still happen. What next?

Update your drivers next, then scan for malware. If crashes continue after both of those steps, check Event Viewer for error codes that point to a specific program or driver. If you still cannot find the cause, a technician can run diagnostic tests on your hard drive and power supply to check for hardware failure.

Can a Windows update cause crashes?

Yes, occasionally a Windows update introduces a bug that causes crashes in specific programs or hardware setups. If crashes started right after a Windows update, try uninstalling the most recent update. Go to Settings, Update and Security, Windows Update, View Update History, and click Uninstall Updates. Select the most recent update and uninstall it.

How do I know if my hard drive is failing versus just being full?

A full drive causes slowdowns and crashes that stop once you free up space. A failing drive causes crashes even after you delete files, and you may hear clicking or beeping sounds from inside your computer. If you hear those sounds, back up your files when ready and have a technician replace the drive.