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The reason for the problem is that the GUID is the same as an existing site. You could either delete the old site or create a new web application and restore in that new one.

And in the microsoft.com , it said: 

To back up and to restore profile information, you must perform the following actions:

• In Office SharePoint Server 2007, you must complete a full SSP backup and restore operation. For example, if you are concerned about data corruption in the SSP database, and you have a backup from before the point of suspected corruption, you can restore that SSP backup to obtain the full set of information.
• In SharePoint Portal Server 2003, you must complete a full backup and restore operation for the _PROF database that the portal application uses. This process may require that you restore the portal application.

The following are the two components to the My Site data:

• Personal site - The personal site includes documents and lists. This information is stored as a SharePoint site in the content database.
• User profile - The user profile includes information about profiles, links, and details. This information is stored in the SSP or in the_PROF database.

If you want to restore user profile data, do not create a new SSP. There is no supported way to back up only the profile information from the SSP, and then to restore the information to a new SSP.