Different time in Windows and Linux Mint

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http://unix.stackexchange.com – I installed Linux Mint first on my Acer Aspire 4930 and then dual booted with Windows 7. I see the correct time on Linux Mint but on booting into Windows the time is shifted back by a few hours, even after re-setting the time on rebooting it shows the wrong time again. Why is this happening? (HowTos)