cubase elements 7 can't locate vst path

i am a cubase elements 7 user, with installed the 32 bit version in a 64 bit computer.
recently i sucessfully installed ezdrummer 2 32bit version and work fine on cubase.
i decided to reinstall it and install it as 64 bit version, but after installing, there is no "ezdrummer " in my vst instruments.
i’ve checked the vst path in ezdrummer, and added this path in cubase>vst information.
i closed the application and update the vst information, but it just doesn’t work.
my cubase can’t find ezdrummer, though ezdrummer work fine standalone.
Is it caused by the 32/64 bit version or what?
thank u for ur support