Toshiba win7 common module driver

Hello, I have a Toshiba Satellite C855-2GJ and I want to upgrade my operating system from win xp to win 7. I have searched the net and saw that there are some compatibility problems between Toshiba common modules for win xp and Toshiba win7 common module driver. So, I need to know which is the best way to upgrade my system without anything going wrong?
