Unable to login OSX 10.7 Lion on 2011 MacBook Pro

Hello,
For some reason I am having difficulty logging into Lion, once I enter my password to login, I am taken to a white screen for about 2 seconds, then I am pushed back to the login screen. I've tried logging in with the "Root" account too, but had no luck logging in. Does anyone have any suggesions as to how this could be fixed? I have also, from Disk Utility, tried to run a "Repair Disk Permissions" and a "Repair Disk" function, but have had no luck. Thanks.
Here's a YouTube video that shows exactly what is going on.
http://www.youtube.com/watch?v=K1M32JSXxJw

thanks for your reply...
yes, I realize it will only install on older macs... my Mac Pro is the 1,1 model... the 2.66mhz processor is from the 2006-2008 era....
i believe it shipped with 10.4 or 10.5 OSX...
it was previously running 10.7.5 which is the newest OSX that was allowed to be installed on it....
so it should allow 10.7 to be installed? Or do I have to start with the much older osx?
I downloaded Lion 10.7 from the mac app store and it of course wouldn't let me install it on anything, even the 4tb SSHD drive when I connected it via USB/SATA adapter to macbook pro as it is too old for running 10.7 install on this machine but I was apple to use SuperDuper app to make a boot drive of the 10.7 download form the mac app store onto a 8gb USB flash drive and make it bootable...
The 4tb SSHD drive appears to work on system as I can run disk utility and format it and mount it etc etc...
Perhaps there is something wrong with my install USB flash drive I made? I am really stuck here...
thanks for your help...

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