text: my cpu usage is 100%? my internet had slowed right down and i have noticed when i close the window it fails to respond and the cpu usage goes up to 100. i have done virus checks spyware checks etc and have found nothing anyone have any suggestions? x likely that you have some background programs running, such as viruses or the opposite such as a "spysweeper" to clean out your computer. if this continues open up the "window task manager" and then click "processes" which then you should end most tasks that shows your account name next to the task. do not end process called explorer.exe. in order to determine all the tasks you should end press the "run" button under the start menu then type "msconfig" and then click startup. cancel everyone that is not found in a folder path leading to microsoft windows...hope this helps...