Windows Installer Service could not be access

Windows Installer Service could not be access
The Windows Installer Service could not be accessed.
This can occur if you are running Windows in safe
mode, or if the Windows Installer is not correctly
installed. Contact your support personnel for assistance.

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look like once it's installing on a 64 bit windows 7 environments. this 


  • net start MSIServer 
  • My Computer, Right click on manage 
    click  Services,  click Windows Installer 
    make the Service Automatic, close 
    In right pane of window click on Start to start this service.
  • Under Control Panel -> Administrative Tools -> Services 
    Right click on the Remote Procedure Call (RPC) Service 
    Select Log In Tab 
    Select Log As "Local System account" and tick "Allow service to interact with desktop" 
    You'll get a message that settings wont take effect until you restart the service. To do this you'll need to reboot your PC. 
  • Unregister and re-register the Windows Installer 
    Click Start, click Run, type MSIEXEC /UNREGISTER, and then click OK. Even if you do this correctly, it may look like nothing occurs. 
    Click Start, click Run, type MSIEXEC /REGSERVER, and then click OK. Even if you do this correctly, it may look like nothing occurs, or you may briefly see an hourglass. After you run this command, the operation is complete. 
  • right click command prompt and chose "run as administrator" . Type "regsvr32 c:\windows\system32\msi" press end and try to install again.
  • regedit:
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSIServer
    Look for WOW64 and it's value.
    Is it 0x00000001 (1) ?

    This value tells Windows Installer only to deal with 32-bit installers and to return you an error whenever you try to install something that is 64-bit. To fix it, just set the value to 0. So you will see in your editor:

    WOW64 REG_DWORD 0x00000000 (0)

    After changing the value to zero, restart your Windows Installer Service by using services.msc or reboot.

    This simple solution of changing the 1 to a 0 allowed me to finally install Itunes on Vista 64.
  • Click Start-->Run-->type services.msc press Enter 
    in the Service window select Server. 
    if its stopped please start it and if its running please restart the service. I stopped it and strted it again. Then went to Windows Installer previously changed to automatic from manual and also checked under logon tab "Allow service to interact with desktop". Previously tried to start services, would not start. After I stopped and started the local server, I was able to start the window installer services and then install all my software.
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