Installing a new version side by side?

[shaul]

Hello,
I have wrote a program and also added "Setup Project" to install it.
It's been a while and now I have finished with the next version. but I want to install the new version along with the old version. When i'm trying to install the new version I'm getting a pop up message during the installation which inform me that I can't do it.
Is there a way to install the 2 programs side by side?

Thanks a lot
sorry for my english..

Shaul