OK guys...i didn't go through all the pages and i don't know if anyone has posted anything about this but here it is...
You can check your system compatibility with any game on the following website..
Can You Run It?
in this site you just have to select the game you want to play on your machine and it shows you a comparative result of your pc specs and the minimum reqirements of the game..!!!
Works for me...!!helped me lot to choose games..!!!
Cheers...!!!keep gaming...!!!!
P.S. i couldn't get it to work on firefox..but surely works with internet explorer..!!