How can I run 2 differeny Firefox versions

I have Win 7 x64 operating system.
How can I run two different FireFox versions?
I want to be able to run FF3.6 and FF10
But it seems its set up the way that I can only install one of them.

Do a custom install and install each version in its own program folder to use multiple Firefox versions.
* https://support.mozilla.com/kb/Custom+installation+of+Firefox+on+Windows
Create a new profile exclusively for each Firefox version.
Create a desktop shortcut with -P "profile" appended to the target to launch each Firefox version with its own profile.
See these mozillaZine KB articles for information:
* http://kb.mozillazine.org/Testing_pre-release_versions
* http://kb.mozillazine.org/Creating_a_new_Firefox_profile_on_Windows
* http://kb.mozillazine.org/Shortcut_to_a_specific_profile
* http://kb.mozillazine.org/Using_multiple_profiles_-_Firefox
* http://kb.mozillazine.org/Opening_a_new_instance_of_Firefox_with_another_profile

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