Windows Explorer crashing

I've owned my Vista for a few years now, and I'm overall happy with it. It runs smoothly, the graphics card is decent enough to play alot of games, and the audio is awesome. I'm finding one persistent problem, though. Every now and again, the CPU usage will shoot up to full then drop back down again, and Windows Explorer crashes. It takes a little while to bring all of the windows back up. I've even changed my theme from Aero to the Classic windows. I have no idea why it does this. I have anti-virus, and I do scans every night. I keep all of my drivers updated and running. Any tips?
 

My Computer

System One

  • Manufacturer/Model
    Dell Inspiron 530S
    CPU
    Intel Celeron 2.20 GHz
Welcome
In addition to the AV scans, download and scan with malwarebytes then report back.
 

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
Welcome
In addition to the AV scans, download and scan with malwarebytes then report back.

Yeah, I've ran Malwarebytes, yet it hasn't found anything. My AV, Norton 360, says that the system's clean, too. I have no idea of what to do next. I don't have the money to bring it in the shop for such a small problem, but it's really starting to get annoying. In any case, thanks for the help!
 

My Computer

System One

  • Manufacturer/Model
    Dell Inspiron 530S
    CPU
    Intel Celeron 2.20 GHz
Next time it happens go to search and type event viewer. Go to administrative in the left panel and see what it gives for a cause. Give us code numbers, etc.
 

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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