Here is a fix that I have finally found and it worked on my computer.

For the past month, I have been trying to install the 64bit edition of
Itunes onto my mom's new computer. She has Vista Home Premium 64bit
edition.
Everytime we tried to install itunes we would receive this error:

"The Windows installer service could not be accessed. This can occur if
you are running windows in safe mode, or if windows installer is not
correctly installed. Contact your support personnel for assistance"

Actually, everytime we tried to install any 64bit program we would
receive this same error. I searched high and low and tried countless
solutions.
Unregistering and reregistering the installer service, stopping and
restarting, using the Windows installer cleanup utility, etc...none of
these things helped.

Today I came across a blog "Think#Knowledge Blog" that SOLVED my
problem.

This is the solution that worked for me:

Go to this registry key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Servic es\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.


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