High CPU usage slows down your computer and can cause freezing of computer operations. Consider troubleshooting this problem yourself---you will save money on a computer tech, and know how to fix this issue in the future. No special software is needed, and diagnosis can be made with the software already included in windows XP.
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Press together "Ctrl+alt+del." A window will pop up called "Task manager."
Click the tab titled "Processes." You will see a list of programs.
Sort the programs by CPU usage. Double click the title above the row labelled "CPU." The highest usage is now at the top.
Right click on the program and choose "End Process" to close the program. Now that you know what program it is, you can uninstall it from your system to regain proper computer functionality.