You can identify unnecessary processes running on your PC by using Windows Task Manager. To open Windows Task Manager, press Ctrl + Alt + Delete and then select Task Manager. In the Processes tab, you can sort by CPU, Memory, and Disk usage to see which processes are taking up the most resources. You can also view the Description column to help identify what each process is used for. If you identify any processes that you don’t recognize or aren’t sure of, you can search online for more information.