CS3 Problem

Greetings,
I have downloaded and installed the trial version of Adobe Flash CS3,but when I click to it in order to start using it I get this error:

Licensing for this product has stopped working:
“You cannot use this product at this time.You must repair the problem by uninstalling and then reinstalling this product or contacting your IT administrator or Adobe customer support help.”

Any ideas?
Thanks in advance.