Norton 2011 already installed

Presently  my NAV  2011 is already on my computer. I am unable to renew via the express renewal because your system does not recognize. It says unable to verify.  And it will not allow me to go any futher. 

 

So i just purchased NAV 2012.  And now I am unable to install this because it says there is incompatibility issue with my operating system. I have Vista  64 or 32 bit. 

 

Please advise.  Can i just get a refund for the 2012 product  ?  How do i do that ?    Pleaes advise. thank you