first why would you give out your personal serial number? Assuming it was your real one and not generated one, the chances are now you just lost your copy of CS6 as it will be deemed as a copy
secondly, if you have already run the cc trial then your 30 days are up.
and finally just run the setup from the cd of cs6 or wherever you have it stored.
I suspect you already tried this, and are getting errors, perhaps if you tell us then it might show a path for you to take.