Access denied while installing arduino drivers

Hi,

I’ve already installed and worked on arduino in my school, so I bought it for myself and then I encountered a problem while installing drivers for my arduino, whenever I try to install them (device manager, right click blah blah blah) message pops out telling me that access is denied. I’ve tried googling it and couldn’t find any solution that works. OS is windows 7 64 bit professional, i am on administrator account and drivers folder is not encrypted(common problems).

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Thy this driver for your OS http://www.ftdichip.com/Drivers/VCP.htm