Help...my boss lock my computer....

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hi all...this my 1st post here in mylot...im working at cyber cafe...and using cashier pc to get online...the problem is,my bos blocking me from opening local disk C and D 2 day ago...any 1 here know how to unlocking it...i already try search on google,youtube,yahoo...etc...but never find the answer...so,plzzz...help me here...coz many of my file i save on that disk...