I have a windows 7 operating system as a test environment. I have SQL Server EE installed with two instances, named as test and production. I took a full backup from AdventureWorks database from test instance and I tried to restore it into the production instance:

RESTORE DATABASE [testikanta] FROM  DISK = N'C:\Program Files\Microsoft SQL Server\MSSQL10.SQL2008TESTI\MSSQL\Backup\AdventureWorks.bak' WITH  FILE = 1,  NOUNLOAD,  REPLACE,  STATS = 10
GO

I got an error saying:

Msg 3634, Level 16, State 1, Line 1
The operating system returned the error '32(failed to retrieve text for this error. Reason: 15105)' while attempting 'RestoreContainer::ValidateTargetForCreation' on 'C:\Program Files\Microsoft SQL Server\MSSQL10.SQL2008TESTI\MSSQL\DATA\AdventureWorks_Data.mdf'.
Msg 3156, Level 16, State 8, Line 1
File 'AdventureWorks_Data' cannot be restored to 'C:\Program Files\Microsoft SQL Server\MSSQL10.SQL2008TESTI\MSSQL\DATA\AdventureWorks_Data.mdf'. Use WITH MOVE to identify a valid location for the file.
Msg 3634, Level 16, State 1, Line 1
The operating system returned the error '32(failed to retrieve text for this error. Reason: 15105)' while attempting 'RestoreContainer::ValidateTargetForCreation' on 'C:\Program Files\Microsoft SQL Server\MSSQL10.SQL2008TESTI\MSSQL\DATA\AdventureWorks_Log.ldf'.
Msg 3156, Level 16, State 8, Line 1
File 'AdventureWorks_Log' cannot be restored to 'C:\Program Files\Microsoft SQL Server\MSSQL10.SQL2008TESTI\MSSQL\DATA\AdventureWorks_Log.ldf'. Use WITH MOVE to identify a valid location for the file.
Msg 3119, Level 16, State 1, Line 1
Problems were identified while planning for the RESTORE statement. Previous messages provide details.
Msg 3013, Level 16, State 1, Line 1
RESTORE DATABASE is terminating abnormally.

Where's the problem? I'm running these instances as on local machine adminstrator (SQL Server services are running with the same account).