I found finally the solution that i will share with you.
1- download the driver asio4 all: http://www.asio4all.org/
2- Open cubase and choose asio4all as audio driver.
3- In the configuration panel go to audio vst system (everything is in french for me so i try to translate it)
4- Clicks on the gray button dashboard under the asio4all page and then choose voicelive by clicking at your left where there is an arrow. You’re done.
Voicelive will appear.
5- under vst link; choose voicelive as audio input and output.
You’re done.