there is a problem opening facebook account in pantium 4 window xp secuirty certificate not valid?

i use vwirless ptcl internet when i open face book account or any other web site a security messege apears countineus that certificate not valid i use pantium 4 with window xp.
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More about problem opening facebook account pantium window secuirty certificate valid
  1. What browser (Internet Explorer, Google Chrome, Firefox, etc.) are you using and what version of the browser are you using?
  2. The problem is with the system date.
    First Check your system date. If it is resetting to 2006 or 2009 each time after reboot "Change your CMOS battery."
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