Msg 5133, Level 16, State 1, Line 2
Directory lookup for the file "D:Program FilesMicrosoft SQL ServerMSSQL10_50.MSSQLSERVERMSSQLDATADb.mdf" failed with the operating system error 21(failed to retrieve text for this error. Reason: 15105).
Msg 3156, Level 16, State 3, Line 2
File 'Db' cannot be restored to 'D:Program FilesMicrosoft SQL ServerMSSQL10_50.MSSQLSERVERMSSQLDATADb.mdf'. Use WITH MOVE to identify a valid location for the file.
Msg 5133, Level 16, State 1, Line 2
Directory lookup for the file "D:Program FilesMicrosoft SQL ServerMSSQL10_50.MSSQLSERVERMSSQLDATADb_log.LDF" failed with the operating system error 21(failed to retrieve text for this error. Reason: 15105).
Msg 3156, Level 16, State 3, Line 2
File 'DbDev_log' cannot be restored to 'D:Program FilesMicrosoft SQL ServerMSSQL10_50.MSSQLSERVERMSSQLDATADb_log.LDF'. Use WITH MOVE to identify a valid location for the file.
Msg 3634, Level 16, State 1, Line 2
The operating system returned the error '21(failed to retrieve text for this error. Reason: 15105)' while attempting 'GetVolumeInformation' on 'D:'.
Msg 3013, Level 16, State 1, Line 2
RESTORE DATABASE is terminating abnormally.

LogicalName PhysicalName    Type    FileGroupName   Size    MaxSize FileId  CreateLSN   DropLSN UniqueId    ReadOnlyLSN ReadWriteLSN    BackupSizeInBytes   SourceBlockSize FileGroupId LogGroupGUID    DifferentialBaseLSN DifferentialBaseGUID    IsReadOnly  IsPresent   TDEThumbprint
Db  D:Program FilesMicrosoft SQL ServerMSSQL10_50.MSSQLSERVERMSSQLDATADb.mdf  D   PRIMARY 29622272    35184372080640  1   0   0   02925462-83CC-4222-8966-53229FA25B1C    0   0   29032448    512 1   NULL    269000000146900238  735C7F0E-F63D-4AA1-AC48-505A084AC00B    0   1   NULL
Db_log  D:Program FilesMicrosoft SQL ServerMSSQL10_50.MSSQLSERVERMSSQLDATADb_log.LDF  L   NULL    40239104    2199023255552   2   0   0   71038B04-CBC9-4E4A-93AD-4E1268859CB2    0   0   0   512 0   NULL    0   00000000-0000-0000-0000-000000000000    0   1   NULL
DbDev_filestream    D:Program FilesMicrosoft SQL ServerMSSQL10_50.MSSQLSERVERMSSQLDATADb  S   PRIMARY_FILESTREAM  4691012 0   65537   18000000011800001   0   627C9AAA-97BD-4991-9C8C-90C400226A9F    0   0   4784128 512 2   NULL    269000000146900238  735C7F0E-F63D-4AA1-AC48-505A084AC00B    0   1   NULL

Use WITH MOVE to identify a valid location for the file.

USE [master]
RESTORE DATABASE [AdventureWorks2008R2]
FROM  DISK = N'C:SQL BackupsAdventureWorks2008R2.bak'
WITH  FILE = 1,
MOVE N'AdventureWorks2008R2_Data' TO N'C:MyNewDataLocationAdventureWorks2008R2_Data.mdf',
MOVE N'AdventureWorks2008R2_Log' TO N'C:MyNewLogLocationAdventureWorks2008R2_Log.ldf',
MOVE N'FileStreamDocuments2008R2' TO N'C:MyNewFileStreamLocationDocuments2008R2',
NOUNLOAD,  REPLACE,  STATS = 1
GO