Pipesim 2003 and Pipesim 2007

[ANT74]

Dear Friends
May i install Pipesim 2003 and Pipesim 2007 in the same computer and run any of them individually? I asked a question like that because there has been always conflicts when i tried and i succeeded once but it opened only pipesim 2007 although i clicked on Pipesim 2003 icon from the folder? Please explain me.
Thanks a lot

[mnn2005]

PIPESIM allow one version installed only so even when you click on the Icon name Pipesim 2003, it is actualy linked to the file Psim2000.exe hence PS2007 open