windows installer service could not be accessed <SOLVED>

When trying to install on vista 64bit. I received this error message:
"windows installer service could not be accessed"

I tried many things...nothing worked.....But this one did...

http://www.windowsbbs.com/windows-vista/82460-vista-home-premium-x64-installing-itunes-solution.html

Go to this registry key:


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 eset on Vista 64.

Hope this helps some other poor soul.