Just follow the instructions on the link to the Samsung support above, it's unbelievable easy to use. But I agree, this search was my last try before uninstalling MultiScreen.
This software is hopeless - there are no instructions on how to set it up and the video tutorial is meaningless - a joke!! I have been through all the possible permutations with the software - the grids flash up onto the screen for less than a second and disappear and yes I am using a brand new Samsung monitor - which I am returning.
But it still wants to install 2007... (because of the 4 in the beginning of the version number)