My computer keeps Turning Itself off

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Help -
my laptop keeps turning itself off. I run Panda AV Software.
On restarting I get these messages :
program files/panda software/panda titanium antivirus 2005/firewarll/travlog
log entry is not valid
local settings/temp/Dfd70e.tmp log entry is not valid. entry truncated
local settings/temp/Dfd71D.tmp log entry is not valid. entry truncated

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