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Defragment the HDD (Hard Disk drive)
When you install and uninstall programs or when you move files, you leave behind leftovers known as fragmented files. Fragmented files can slow your computer down and cause a system crash especially if a program becoms unresponsive.
When your computer crashes and you see the following line: STOP 0x000000EA (THREAD_STUCK_IN_DEVICE_DRIVER), the video card driver is stuck waiting for something (usually a hardware operation) to happen. Most of you have probably seen nv4_disp.sys associated with this blue screen.
Updating the video card driver is one of the solutions to this problem. Before you download the latest driver check the model of your video (VGA) card (Nvidia or ATI Radeon).
Nvidia - click here to find the appropriate driver
ATI Radeon - click here to find the appropriate driver
Enter the exact model of your video card (which you can find in Start -> All programs -> Accessories -> System tools -> System Information or type System Information in the start menu search box -> Components -> Display) -> select the Windows version you use (Windows 7/8(.1)/10 32-bit or 64-bit) and download the driver.
After that, run the installer and follow the instructions. Reboot your computer if needed.
Note: If you don't know which Windows version you use and the system type (32-bit or 64-bit), right-click My Computer (This PC) and select Properties.
Some computers have only on-board video card driver (eg. Intel HD Graphics) and to update it you need to visit your motherboard manufacturer's website (which you can also find in System Information -> System Summary).
If you experience issues with your computer that you tried to but couldn't resolve by yourself and you don't want to format it because of the sensitive data you have on it, refreshing your computer should help you fix it.
If you wonder "Why does my phone keep freezing up?" bear in mind that the operating system itself may be the reason. There is a good reason why regular system updates are recommended - they can improve the performance of your mobile device, fix bugs that cause system crashes and etc.