Attachement of database

Question

Hi,

when i try to attach my database this error has occured :

The database 'Call_center1' cannot be opened because it is version 655. This server supports version 612 and earlier. A downgrade path is not supported.Could not open new database 'Call_center1'. CREATE DATABASE is aborded.(Microsoft SQL Server,Erreur:948) 

knowing that this database was created in sql server 2008 and now i try also to attach it in sql server 2008 but in windows 7 , Please help me :(