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why does my cpu usage go to 100

The average Windows PC is permanently busy, constantly juggling system resources between the 50 or more processes it's running at any one time. Sometimes, for no apparent reason, a rogue application will demand all your processor's attention, and before you know it the process is running your processor at 100% all of the time. This will feel like a major disaster, especially if you've unsaved work in other applications. They will be very unresponsive, it'll be difficult to switch to them, and even if you manage it then little will seem to happen. Just redrawing the screen may take an age. So your first step should be to try and regain control over your system, reducing the impact of the resource-hogging app and allowing access to other programs again. CHECK TASKS: Task Manager will quickly highlight the resource-grabbing application Press Ctrl+Shift+Esc to launch Task Manager, then, click the Processes tab and choose "Show processes from all users".

You should now see everything running on your PC at the moment. Then click the CPU column header to sort by CPU usage, and look for the process that's the most demanding. (No CPU column? Click View Select Columns, check the "CPU Usage" box and click OK. )
Once you've discovered the offending process, right-click it and select Set Priority Low. This tells Windows that just about everything else you're running is more deserving of CPU attention, and may make a very small difference in system responsiveness. Now right-click the process again, select Set Affinity, and clear all but one of the CPU boxes. The "Processor Affinity" setting tells Windows which CPU cores are allowed to run a particular application, and so by restricting it to one you'll free up the others for the rest of your programs.

BRING IT ROUND: Blocking your rogue process from all but one CPU will quickly bring it into line The results should be visible immediately, with CPU usage dropping and other programs becoming usable again. Switch to any applications that contain unsaved work, or that you need to be sure are closed properly (your email client, say), save any documents and close them down. And then close everything else non-essential, to simplify your system: all running applications, any system tray icons that are surplus to requirements, the lot. Determine how to proceed with troubleshooting the misbehaving program. Perform an internet search on the process name that you force-quit. This will help you figure out what the process is used for, as well as what steps to take to keep it from running at 100%. There are typically a few different ways that you might combat high CPU usage from a certain program: Uninstall - If the program isn't a necessary one, may be the easiest way to keep it from bogging down your system.

Reinstall or update - Sometimes a bug in the program is causing it to take up all of your CPU. Reinstalling the program or applying an update from the developer may fix the problems you are experiencing. Remove the program from your startup sequence - If the program is causing your computer to boot slowly, but you need it installed, you can. Run virus and malware scans - If your research shows that the program is malicious, you may need to remove it using an antivirus or antimalware program. Viruses aren't very common for Macs, but they do exist. Adware is a much more common problem, and these programs can put a big strain on your processor. One of the best anti-adware tools is AdWare Medic, which you can get for free from adwaremedic. com.

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