To change security for the grid agent service user
        
         
         
          - In Windows Explorer, navigate to the directory on the host where the grid is installed. 
 
          - Right-click on this directory, select Properties, and click on the Security tab.
 
          - Click the Advanced button to display the Advanced Security Settings for Gridname dialog box. 
 
          - In this dialog box, click Change Permissions... to display the Permissions dialog box.
 
          - Click Add and select the same user you set earlier as the service user. Then click OK.
 
          - On the Permission Entry for Gridname dialog box, do the following:
           
            - Make sure that the Apply to: field has the value "This folder, subfolders and files". 
 
            - Select the Allow check box for Full Control.
 
            - Select the check box for "Replace all child object permissions with inheritable permissions from this object".
 
           
 
          - Click OK repeatedly until you have closed all dialog boxes.