You have the permission problem in database file. To come through this you have to give full permission on .MDF and .LDF Files to overcome with the error.

Second thing you can attach the database using wizard rather using the Script.

For to attach database : In Object Explorer --> Right Click On DATABASE --> Click Attach and then select your .MDF file.

You have a permission problem on a database file. To resolve this you need to give full permission on .MDF and .LDF Files to the account used by SQL Server.

Second thing you can attach the database using wizard rather using the Script.

In Object Explorer --> Right Click On DATABASE --> Click Attach and then select your .MDF file.