not possible to have beta12 3.6.15 and 4.0 on the same computer

I had on my machine (win7) firefox 3.6.15
These days, I discovered firefox 4.0Beta12 and install it. It's great. I put the finger on the task bar the two of them.
After a reboot it is not possible to run the 4.0Beta12 again. no taskbar, no "C:\Program Files\Mozilla Firefox 4.0 Beta 12\firefox.exe". whenever he opens 3.6.15

Yes, it is possible.

Use it according to one of the above, '-P' option so that you can start Firefox with the right profile for this version, but add the following option as well -no-remote.

According to KB article Command_line_arguments - n-profile option: allows to run several instances of the application with different profiles; used with Pei

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