Right i need this answered quick, so thought id post here!

Right i have cubase sx3 and i downloaded some vst - piano , and well i downloaded the zip file , then i browsed through program files , clicked steinberg then cubase sx3 then opened vstplugins folder, i then extraced the new downloaded files into that folder(vstplugins)
i then opened cubase sx3 and looked under vst instruments but it was not to be found, what am i doing wrong?
Perhaps you have to locate the plugin manually?

Just a guess, but the program may not auto-detect things in the plugins folder.