I have created a certificate and am taking a backup to a .cer file so
that an Initiator service can use it for sending messages:
BACKUP CERTIFICATE InstTargetCertificate
 TO FILE = N'E:\Personal\me\Tgt.cer';
GO
The .cer file gets created. But I get a message saying "Acces is
denied" as if the file is currently in use when I try to copy it to
any other directory.

Can you explain why this is happening?
I have CREATE CERTIFICATE permission and CONTROL permission on the
certificate created.

I am using SQL server 2005 on Win XP.

Thanks,
Yash