A frozen computer usually means one program is using all your processing power, or your hard drive is full
When your computer stops responding to mouse clicks or keyboard input, the first step is to force-close whatever program is causing the problem without shutting down the whole machine. Most of the time a single stuck process is the culprit, not a hardware failure. You can almost always regain control by using a keyboard shortcut that bypasses the frozen program.
On Windows, press Ctrl + Alt + Delete at the same time. On Mac, press Command + Option + Escape. This opens a window showing all running programs. Find the one that says "Not Responding" next to its name, click it once to select it, then click the button to close it (labeled "End Task" on Windows or "Force Quit" on Mac). Your computer should respond again within a few seconds.
If the keyboard shortcut does not work and your computer is completely unresponsive, hold down the power button for ten seconds until the machine shuts off completely. Wait thirty seconds, then turn it back on. This is a hard shutdown and should be your last resort, but it works when nothing else does.
Key Takeaways
- Press Ctrl + Alt + Delete on Windows or Command + Option + Escape on Mac to open the task manager and close the frozen program without restarting.
- A full hard drive or a program using too much memory causes most freezes, and both can be fixed without replacing hardware.
- If your computer freezes regularly, check how much free space you have on your drive and close background programs you do not use.
- Restarting your computer clears temporary files and memory, which fixes freezes caused by programs that do not release resources properly.
Check your hard drive space before the next freeze happens
A hard drive that is nearly full forces your computer to work much harder, and freezes become more common as you approach capacity. You need to know how much space you actually have left. On Windows, open File Explorer, right-click "This PC" on the left side, and click "Properties." Look for the bar labeled "Local Disk" — if the blue section takes up more than 85 percent of the bar, your drive is too full.
On Mac, click the Apple menu in the top left corner, select "About This Mac," then click the "Storage" tab. If the colored bar shows less than 10 to 15 percent gray space at the end, you need to free up room. The easiest way is to move large files you do not use often to an external hard drive or cloud storage like Google Drive or OneDrive. Delete old downloads, empty your Recycle Bin or Trash, and uninstall programs you no longer use.
If you are close to full and cannot delete anything, your computer will freeze more and more often until you add storage. An external hard drive costs between forty and eighty dollars and solves the problem permanently.
Close programs running in the background that you do not see
Many programs start automatically when you turn on your computer and stay running even when you are not using them. Each one uses memory and processing power. If too many are running at once, your computer slows down and freezes. You can see which ones are active and turn off the ones you do not need.
On Windows, right-click the taskbar at the bottom of the screen and select "Task Manager." Click the "Processes" tab if it is not already selected. Look at the "Memory" column — programs using more than 500 MB are heavy users. If you recognize a program you do not need running right now, click it once and click "End Task." Do not close anything labeled "Windows" or with a name you do not recognize, because those are system programs your computer needs.
On Mac, open Spotlight by pressing Command + Space, type "Activity Monitor," and press Enter. Click the "Memory" tab. Programs using more than 200 MB of memory are worth closing. Click the program name once, then click the X button in the top left corner of the window and confirm. Again, leave anything labeled "kernel" or system processes alone.
Restart your computer to clear memory and temporary files
A restart clears your computer's memory and removes temporary files that programs leave behind. Many freezes happen because a program has a small bug that causes it to hold onto memory it should have released. Restarting fixes this without any action on your part. If your computer freezes once and then works normally for days, a restart is all you need.
On Windows, click the Start menu, click the power icon, and select "Restart." On Mac, click the Apple menu, select "Shut Down," check the box that says "Reopen windows when logging back in," and click "Shut Down." When your computer turns back on, it will restore your open programs and windows to where you left them.
If freezes happen regularly even after restarting, the problem is usually one of the issues covered in the sections above — a full hard drive, too many background programs, or a program with a serious bug. A restart will not fix those, but the steps in this article will.
Update your operating system and programs to patch bugs
Software companies release updates that fix bugs causing freezes and crashes. If you have turned off automatic updates or ignored update notifications, you may be running old versions with known problems. Checking for updates takes five minutes and often solves freezing issues.
On Windows, click the Start menu, type "Windows Update," and press Enter. Click "Check for updates." If updates are available, click "Install now" and let your computer restart when prompted. On Mac, click the Apple menu, select "System Settings," click "General" on the left, then click "Software Update." If an update is available, click "Update Now."
You should also update individual programs. Most programs check for updates automatically, but you can force a check by opening the program, looking for a menu item that says "Help" or "About," and clicking "Check for Updates." Programs like Chrome, Firefox, and Microsoft Office update frequently and often include fixes for freezing problems.
Run a malware scan if freezes started suddenly
Malware — unwanted software installed without your permission — can cause freezes by using your computer's resources or interfering with how programs run. If your computer froze suddenly after visiting a website or downloading something, malware is worth checking for. Windows comes with a built-in malware scanner called Windows Defender that you can run for free.
On Windows, click the Start menu, type "Windows Security," and press Enter. Click "Virus & threat protection" on the left. Under "Current threats," click "Scan options," select "Full scan," and click "Scan now." The scan takes thirty minutes to an hour. If malware is found, Windows Defender will remove it automatically.
On Mac, malware is less common, but you can read Malwarebytes for Mac free from their website. Open the program, click "Scan," and let it run. If nothing is found after a scan, malware is not your problem. If a scan finds something, follow the program's instructions to remove it.
Check if a single program freezes your computer every time
Sometimes one specific program causes freezes while everything else works fine. If you notice your computer always freezes when you open a particular process, that program has a bug or is not compatible with your system. You have three options: update the program, reinstall it, or stop using it.
First, check for updates as described in the section above. If an update is available, install it and test whether the freezes stop. If there is no update or updating did not help, try uninstalling and reinstalling the program. On Windows, click the Start menu, type "Add or remove programs," and press Enter. Find the program in the list, click it, and click "Uninstall." Then read the program again from the official website and install the newest version.
On Mac, open Finder, click "Applications" on the left, find the program, right-click it, and select "Move to Trash." Empty the Trash, then read the program again from the official website. If reinstalling does not fix the problem, the program may not work well with your computer, and you may need to find an alternative.
Frequently Asked Questions
Is it bad to force-quit a program or do a hard shutdown?
Force-quitting a program is safe and designed for this exact situation. You may lose unsaved work in that program, but your computer and other programs are not harmed. A hard shutdown (holding the power button) should be your last resort because it can occasionally damage files, but it is still better than leaving your computer frozen indefinitely.
Why does my computer freeze only when I use certain websites?
Some websites run heavy scripts or ads that use a lot of memory, especially in older browsers. Try updating your web browser first. If freezes continue on specific sites, try a different browser like Chrome, Firefox, or Edge to see if the problem follows you or stays with the original browser. If it stays with one browser, that browser may need reinstalling.
Can a frozen computer mean my hard drive is failing?
Occasional freezes are almost never a failing hard drive. A failing drive usually produces clicking sounds, shows error messages about corrupted files, or causes programs to crash repeatedly rather than freeze. If you hear clicking or grinding sounds from inside your computer, that is worth having checked by a technician, but regular freezes point to the causes covered in this article first.
Should I disable startup programs to prevent freezes?
Yes, if you have many programs set to start automatically. On Windows, right-click the taskbar and open Task Manager, then click the "Startup" tab. Programs marked "Enabled" start when you turn on your computer. Right-click any you do not need running all the time and select "Disable." On Mac, go to System Settings, click "General," then "Login Items," and remove programs you do not need.
What if my computer freezes during startup before I can use it?
If your computer freezes while starting up, restart it by holding the power button for ten seconds. When it turns back on, it may run a repair process automatically. If freezes during startup continue, your computer may have a serious problem that requires professional help, or a recent update may have caused the issue. Try restarting in Safe Mode (hold F8 on Windows while starting, or hold Shift while clicking Restart on Mac) to see if the problem goes away.