Windows Task Manager at 100%

What could make my CPU usage run at 100% thus making my comp freeze? It'll run ok for a while then everything stops and I can't open anything making me turn off comp cold turkey instead of the proper way. I haven't downloaded anything new recently.
 

My Computer

Lets start with this
Run a full and updated anti virus scan
Download and do the same with malwarebytes

If positive report back and we will help

If negative give us a screen shot of task manager, if that is not sufficient, we may need process exploerer; but just task manager for now.
 

My Computer

System One

  • Manufacturer/Model
    Dell XPS420
    Memory
    6 gig
    Graphics Card(s)
    ATI Radeon HD3650 256 MB
    Sound Card
    Intergrated 7.1 Channel Audio
    Monitor(s) Displays
    Dell SP2009W 20 inch Flat Panel w Webcam
    Hard Drives
    640 gb
    Cooling
    Fan
    Keyboard
    Dell USB
    Mouse
    Dell USB 4 button optical
    Other Info
    DSL provided by ATT
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