Database Restore Error - Access is Denied

I am receiving and error while attempting to restore a .bak file into a local instance of SQL 2005 Express.  I have granted myself all conceivable levels of permission, and cannot get past the error.  The error reads 

Restore failed for Server 'CORP-PC-MHOFFER\SQLEXPRESS'.  (Microsoft.SqlServer.Express.Smo) ------------------------------ For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&ProdVer=9.00.5000.00&EvtSrc=Microsoft.SqlServer.Management.Smo.ExceptionTemplates.FailedOperationExceptionText&EvtID=Restore+Server&LinkId=20476 ------------------------------ Program Location:    at Microsoft.SqlServer.Management.Smo.Restore.SqlRestore(Server srv)    at Microsoft.SqlServer.Management.SqlManagerUI.SqlRestoreDatabaseOptions.RunRestore() =================================== System.Data.SqlC ...