Canon EOS Rebel xT communication with Windows 7 Ultimate 64 Bit SOLVED.
After 4 hours of my life and a lot of reading online, I finally got my camera to talk to my computer.
This was also written online too but, It wasn't clearly explained.
So, On the camera, press MENU.
Navigate to to the last Tab to the Right.
It's Orange. (The first choice to change is Language)
The 3rd coice down is Communication.
Press SET and choose Print/PTP.
That's it. Exit and you're done.

My camera WAS set to PC Connection. And, that's how it worked when I was using Windows XP Pro.
Note: I installed & uninstalled ALL the software that came with it and the current versions on the Canon website. Nothing mattered. I also, installed the Microsoft Camera Codec Pack. Nothing happened.
After I reinstalled EOS Utility, latest Zoom Browser, MS Camera Codec Pack still nothing happened. But, ALL these things were installed before I changes the setting on the Rebel xT. So, I don't know if not having all this other stuff and the most up to date versions, would've mattered. I think Not.