trouble with HALion playback when sequencing

Greetings one and all
I have just downloaded the trial version of cubase elements 7 for windows for a uni task, but i had only been used to using cubase 4 in the past back at school.
Im having trouble getting the HALion sounds to actually play back or even make any noise whilst inputting them, yet they will play when i am in the HALion window opening the sounds from the sound bank and making adjustments to them
I don’t know if i necessarily communicated that in the most clear way, but does anyone have any idea what im talking about and if so, can you maybe suggest a way to fix it?