title: SQL server 2008 backup error - Operating system error 5(failed to retrieve text for this error. Reason: 15105)
body: <p>Can anyone help me, I'm trying to backup a database located on localhost\SQLEXPRESS but i keep getting the following error:</p>
  
  <pre><code>Backup failed for Server 'localhost\SqlExpress'.  (Microsoft.SqlServer.SmoExtended)
  
  For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&amp;ProdVer=10.0.2531.0+((Katmai_PCU_Main).090329-1045+)&amp;EvtSrc=Microsoft.SqlServer.Management.Smo.ExceptionTemplates.FailedOperationExceptionText&amp;EvtID=Backup+Server&amp;LinkId=20476
  
  
  ADDITIONAL INFORMATION:
  
  System.Data.SqlClient.SqlError: Cannot open backup device 'C:\backup.bak'. Operating system error 5(failed to retrieve text for this error. Reason: 15105). (Microsoft.SqlServer.Smo)
  
  For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&amp;ProdVer=10.0.2531.0+((Katmai_PCU_Main).090329-1045+)&amp;LinkId=20476
  </code></pre>
  
  <p>Can anyone explain what I'm doing wrong here ??</p>
  
  <p>thanks</p>