i first installed in drive D: then remove everything restart pc and install in C: the only virtual instrument i get in plugin is Halion Se. in installing groove agent and acoutic guitar library and 3 more instruments was installed but there is only halion sonic se in the instrument selection. which folder do they go ?
If installed correctly the instruments will show up in the Halion Sonic SE host list. Not as a separate VST instrument.
Regards 
Cubase LE only includes HALion Sonic SE. Although the additional VST’s installed, they can only be unlocked if you upgrade to an Elements license: