Is it possible to run SAS Enterprise Guide 4.1 and SAS Enterprise Guide 4.3 on the same PC?

I have installed both of them alone on a PC and they will function as needed. If I try to put them on the same PC, Enterprise Guide 4.1 fails to launch and Enterprise Guide 4.3 fails to connect to the Metadata server with an error that our SAS support interprets as a .NET error.