Solved Why does my taskbar clock changes time every so often?

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Its what is called the CMOS battery. It keeps your settings and time, even when the battery and plug are out.
You may need a new one.
 

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
Usually the same battery keeps your BIOS settings. If any BIOS settings are changed from the default, if the CMOS loses power it will revert to factory default. You should be able to get a new one at a discount computer store/site fairly cheap.
 

My Computer

System One

  • Manufacturer/Model
    HP Pavilion m9515y
    CPU
    Phenom X4 9850
    Memory
    8 GB
    Graphics Card(s)
    Some Radeon Cheapie with 512 MB Ram
    Monitor(s) Displays
    CRT
    Screen Resolution
    1280x1024
    Hard Drives
    750 GB SATA 3G
    2 SIIG Superspeed docks w/WD Caviar Black Sata II or III
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