The Date and Time on my PC keeps changing, what could be the cause for this?

Question

Roughly two months ago the Date and Time on my PC keeps back dating to 2005
I have clicked the option 'Internet Time' so that it could continue to auto set itself but its always followed with an Error msg.
I have manually changed the time and date of my PC clock but it resets itself every 24hrs back to 2005.

This date error is causing my Anti virus to constantly say 'outdated definitions' and doesnt install the new definitions as it doesnt recognise the date.
- and within my Start menu all my installed programs flash up in bright orange as a newly installed and unused programs.
- And when i log into my any of my online accounts, i get constant security msgs popping up stating, 'Error: There is a problem with this sites security certificate, continuing to this website is not recommended' and this happens with every single site i need to enter a password into.
(i had Noton and it stated that i had no Viruses on my system)

(These are the obvious effects of the date being wrong on my PC but I am not sure which other effects it might be having)

Why could my computer be doing this?

Answer 1

Your CMOS battery is dead.



How to replace the CMOS battery : http://www.computerhope.com/issues/ch000239.htm









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Answer 2

i think of there's a plague in there yet once you're secured that your pc has an as much as date anti-virus then you would desire to reformat your pc as quickly as conceivable. it may be an infectious virus made via seen uncomplicated. in many situations, the viruses made out of seen uncomplicated are undetectable. Sorry to declare you approximately that... desire I answer your query...

Answer 3

The battery is what keeps settings such as date and time in place, If you follow the instructions below it so easy to replace



http://www.computerhope.com/issues/ch000239.htm

Answer 4

replace cmos battery on the mother board

Answer 5

it might be because of stealth virus.