Error while installation of Symantec Backup Exec 2010

Hello all,

I am getting an error while installing Symantec Backup Exec 2010 trail version, the errors says:- “The backup exec database version you are trying to use does not match the version of this install. Schema changes have been performed on this database which do not match the executables currently being installed. Install will not be able to continue at this time. Please visit the Symantec support web site for more information”.

I would be very much thankful, for your help

Thanks a ton in advance