Firefox 3.66/4.0b2 reverts to beta1 after window close.

Okay, here's exactly how this issue is happening to me:
First, I installed Firefox 4.0 Beta 1. No other version of Firefox was installed previously (new harddrive/fresh OS installation)
Some of my favorite addons were incompatible, so, with 4.0b1 still installed, I then installed 3.6.6
4.0b1 was installed in C:\Program Files\Mozilla Firefox 4.0 Beta 1\ (default)
3.6.6 was installed in C:\Program Files\Mozilla Firefox\ (default)
I then open Firefox 3.6.6 and do some basic browsing.
After a while, I close the window, and about an hour later, try opening 3.6.6 again.
Instead, 4.0b1 opens.
I check my desktop, and I have two shortcut icons (as I should), but both lead to
"C:\Program Files\Mozilla Firefox\"
I direct Explorer to "C:\Program Files\", and, to my surprise, there is no longer a
"Mozilla Firefox 4.0 Beta 1" folder.
I then reinstall 3.6.6 in the default directory.
It opens correctly. I close the browser window, and reopen it. Still 3.6.6
Later, I open it again, and its 4.0b1 again.
Then, I uninstall Firefox, and install 4.0b2.
After closing it, 4.0b1 opens.
What is going on here?!
== This happened ==
Every time Firefox opened
== Closing the Firefox browser, the reopening

Yea, I too have serious problems with that freaking plugin trash container! It just freezes my browser completely whenever i'm on a site that uses flash. That needed to be fixed yesterday. Who is the nerd that created that piece of....i just ask!

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