If you want help resolving why it is not working, you should describe your experience with it in detail, any error messages you see, as well as identify the tech specs for your system so that it can be confirmed as to whether or not your system meets the needs of the software.
If you wish to get a refund then you should follow the information in the page linked below....
Return, cancel, or exchange an Adobe order -
http://helpx.adobe.com/x-productkb/policy-pricing/return-cancel-or-cha nge-order.html