after installing, that requirement won't change. you're probably thinking about the hard drive, which needs at least 6.1gb of space. the only thing now is to install and see if the game can run at 1gb of ram, and if it does, i'm thinking it'll be slow.
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Apuya24 is correct, once you install a game your RAM amount will not change in your computer.
If you're unsure of how much RAM your computer has, these steps will explain how to run a DxDiag report on your machine:
https://easims.custhelp.com/cgi-bin/easims.cfg/php/enduser/std_adp.php?p_faqid=21325
Thanks!