PROBLEM WITH USING FL8 AS REWIRE IN CUBASE

I have a PC with window 7 64bit, I have Cubase 5 and FL8 Producer installed and licenced. I’m having problems getting FL to work as a rewire client within Cubase. I’ve watch videos on how to register FL 8 as a rewire client on my system and have done so. I’ve also tried to set the plug in paths within Cubase to the VST folder containing FL8. In my device menu/VST instruments i still can not use FL8 as a VSTI. However if this helps I can use some of the instruments within FL8 that i have purchased and have stand alone applications for. WHAT I’M TRYING TO DO…Is use FL8 Producer as rewire VSTI within Cubase 5. Can anyone help me Please!