You maybe working on an important project and your PC keeps shutting down randomly every 15 minutes or so. You hit the restart button and then it turns on again. Computer keeps shutting down is not a healthy sign. You need to carry out some simple diagnosis that helps treat the problem. Let us have a look at some of the causes that explains why your PC keeps shutting down randomly. Computer Keeps Shutting Down Many users often complain that their PC keeps shutting down for no apparent reason. There is always some reason that causes these unexpected shut downs and reboots. You need to pin point the exact cause that leads to this malfunction. Only then can you correct the problem and carry out successful computer repairs. The following are some of the reasons why your PC keeps shutting down randomly. Computer Virus The most common cause of computer keeps shutting down is a computer virus. This virus causes unexpected changes in your computer and makes vital changes in your computer operating system. This interference from the virus causes your PC to shut down automatically. You need to use a good antivirus software to keep away the bugs from your computer. Meanwhile, you can try the following instructions and get rid of any bug in your computer. You first need to click on Start and go to Run. In the Run box, type regedit and press enter. You will see a window open and you need to navigate to HKEY_LOCAL_MACHIN. Then continue your navigation through Software, Microsoft, Windows, CurrentVersion, Run. On the right hand side pane, you can find any strange-looking entry like msblast.exe, mslaugh.exe, enbiei.exe, tftp.exe, etc. Delete these entries and you will disable these worms from running at Startup. You need to click Start and navigate your way through Programs, Accessories, System Tools, System Restore, System Restore Settings. Here, check the box that says, 'Turn Off System Restore on All Drives' and select Apply and then OK. Delete the previous system restores by clicking on Start and navigating through Accessories, System Tools, Disk Cleanup, More Options, System Restore and selecting 'Clean Up' and clicking OK. Overheating Another most probable causes of PC keeps shutting down is overheating. If the fans placed within the CPU or laptop fails to cool the machine, it results in unexpected shut downs. This is the desktop computers way to cool down and function normally. You can fix this problem by placing a desk fan near the CPU that will help support the internal fans and keep the machine cool. Those using laptops should keep their laptops on a flat, smooth surface that helps provide proper ventilation for the fans. If overheating is the problem, then correcting it will prevent these shut downs. If you feel the internal fans are having problems, speak to a professional for help and repair of fans. Windows Windows operating system may also be a cause of computer keeps shutting down. This happens when Windows cannot find a setting it needs to function. This error causes it to shut down your PC. Windows reads through hundreds of settings present in the Windows Registry database while one is working on the machine. You need right-click on Start, Control Panel, System, Advance. Then in the Startup and Recovery you need to click on Settings and open a Startup and Recovery window. You need to navigate to System Failure and uncheck the box that says 'Automatically Restart'. Click on 'Apply' and then 'OK'. Once you do this, you computer will cease to shut down automatically whenever there is an error encountered by Windows. Instead, during any system error, you will find your screen turning blue. This is called the 'Blue Screen of Death'. You will get a STOP message that requires the user to manually turn off power and restart the computer. This will give you an idea that the shut down is due a problem encountered with Windows. Corrupt or damaged settings are the reason for shut downs by operating systems. You can fix this problem by using a Registry Cleaner that scans through the registry database. If there are any unwanted, corrupt or damaged files, they will be fixed by the Cleaner. You can find many reliable software on the Internet to download. Install them on your PC and fix any issue with Windows. This may help solve you shut down problem. These were few reasons as to why your PC keeps shutting down. If you are unable to solve the problem from the above mentioned tips, call for professional help. Hope your problem of computer restarting on its own is solved with the tips covered in the above paragraphs.