Open Task Manager when your computer stops responding
Task Manager is the fastest way to force-close a frozen program or restart your computer when nothing else responds. On Windows, press Ctrl + Shift + Esc all at once. This opens Task Manager directly without extra steps. If that does not work, try Ctrl + Alt + Delete, then click Task Manager from the menu that appears.
On a Mac, press Command + Option + Esc to open the Force Quit window, which works the same way. You will see a list of running programs. Click the one that is frozen or using too much memory, then click the button to close it (End Task on Windows, Force Quit on Mac).
Task Manager shows you what is actually running on your computer and how much memory, CPU, and disk space each program is using. If one program is using 90 percent of your CPU or memory, that is why everything else is slow. Closing it often fixes the problem without restarting.
Key Takeaways
- Press Ctrl + Shift + Esc on Windows or Command + Option + Esc on Mac to open Task Manager when ready when your computer freezes.
- Task Manager shows which programs are using the most memory and CPU, so you can close the one causing the slowdown without restarting.
- If a program will not close from Task Manager, or if closing it does not fix the problem, restart your computer through the Start menu or Apple menu.
- A full restart clears memory and stops background processes that have gotten stuck, which often solves freezing and slowness problems.
- If your computer will not restart normally, hold the power button for 10 seconds to force it off, then turn it back on.
Close a frozen program from the Processes tab
Once Task Manager is open, look at the Processes tab (it is usually the default view). You will see a list of programs and how much CPU and memory each one is using. The columns at the top let you sort by CPU or Memory — click Memory to see which program is using the most.
Click the program that is frozen or using too much memory. On Windows, click the End Task button at the bottom right. On Mac, click Force Quit. The program will close when ready. If it was the only thing slowing you down, your computer should respond normally again.
If you see a program you do not recognize using a lot of memory, do not panic. Search the program name online before closing it — some Windows system processes have confusing names. If it is a legitimate Windows file, closing it may cause problems. Close it only if you are sure it is not a system process, or if your computer is so frozen that you have no other choice.
Restart your computer from the Start menu
If closing one program does not fix the problem, or if Task Manager itself is frozen, restart your computer. On Windows, click the Start button (bottom left), then click the Power icon, then click Restart. Your computer will save any open work that programs support, close everything, and start fresh.
On a Mac, click the Apple menu (top left), then click Restart. You will see a dialog asking if you want to reopen windows when you log back in — you can say yes or no depending on whether you want the same programs open when it starts up again.
A restart takes two to five minutes. During that time, your computer will shut down all programs, clear memory, and reload Windows or macOS. Most freezing and slowness problems go away after a restart because stuck background processes are cleared and memory is reset to zero.
Force a restart if your computer will not respond at all
If your computer is so frozen that you cannot open Task Manager or click the Start menu, you need a force restart. Hold down the power button on your computer for 10 seconds. The screen will go black and the computer will turn off completely. Wait 30 seconds, then press the power button once to turn it back on.
A force restart is harder on your computer than a normal one — programs do not get a chance to save their work, and you may lose unsaved documents. But if your computer is completely frozen, it is the only option. After the force restart, Windows or macOS will check the hard drive for errors and may take longer than usual to start up.
If your computer freezes regularly and needs force restarts often, that is a sign something is wrong. It could be a program that crashes, a hard drive running out of space, or a virus. Check your hard drive space in File Explorer (Windows) or Finder (Mac) — if you have less than 10 percent free space, that alone can cause freezing.
Check what is running in the background
Task Manager also shows you programs running in the background that you did not open. On Windows, click the Startup tab to see which programs start automatically when you turn on your computer. If you see programs you do not use, right-click them and click Disable. They will not start next time you restart, which can speed up your computer.
On the Processes tab, look for programs with names like OneDrive, Windows Update, or antivirus software running in the background. These are normal and should stay running. But if you see something you do not recognize, search the name online before disabling it.
Disabling startup programs does not uninstall them — you can always turn them back on later. If you disable something and your computer works better, you have found a program that was slowing you down. If you disable something and something stops working, go back to Task Manager and re-enable it.
Understand when to restart versus closing one program
If Task Manager shows one program using 80 percent of your CPU or memory, close that program first. You do not need to restart your whole computer. Restarting takes several minutes and closes everything you have open. Closing one program takes 10 seconds and leaves everything else running.
Restart your computer if closing programs does not help, if multiple programs are using too much memory, or if your computer is slow even when nothing obvious is running. A restart clears memory and resets background processes, which fixes most slowness problems that closing one program cannot.
If your computer freezes again within a few hours of restarting, the problem is probably not a temporary glitch. It could be a program that crashes repeatedly, a hard drive that is failing, or malware. In that case, look at what programs are running when it freezes, or run a malware scan.
Frequently Asked Questions
Will restarting my computer delete my files?
No. Restarting shuts down programs and clears memory, but your files stay on your hard drive. You may lose unsaved work in open documents if the program does not auto-save. Most modern programs ask you to save before closing, so you will not lose much.
What does "End Task" actually do?
End Task force-closes a program when ready, the same as if you had uninstalled it. Any unsaved work in that program is lost. The program does not get a chance to clean up temporary files or save settings. It is safe to use when a program is frozen, but avoid it for programs that are working normally.
Why does my computer freeze even after restarting?
If freezing happens again within hours, one program is probably crashing repeatedly, your hard drive is nearly full, or malware is running. Check how much free space you have in File Explorer or Finder — if it is under 10 percent, delete old files or programs. If space is fine, run a malware scan or check Task Manager to see what is running when it freezes.
Can I restart my computer while programs are open?
Yes. When you restart, Windows or macOS will ask each program to save its work and close. Most programs will save automatically or ask you to save before closing. You may lose unsaved work in programs that do not support auto-save, but restarting will not damage your files or operating system.
What if Task Manager shows a program I do not recognize?
Search the program name online before closing it. Many Windows system processes have names that sound unfamiliar but are important. If it is a system file, closing it may cause problems. If it is a third-party program you do not use, you can close it or disable it from startup. When in doubt, restart your computer instead of closing an unknown process.