Vaio Fn keys and assist/web/vaio buttons not work

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Hello,

i'm using sony vaio VPECH15EN . recently i changed my OS win7 basic-->win7 ultimate after that my lap's Fn keys and the hot keys assist/web/vaio are not working. please help me to solve it!!!!!!!!!!!!!!!!!!

<config>Windows 7 / Firefox 14.0.1</config>