I have a new Windows 7 Ultimate 32-bit PC and I tried installing some games that seemed to be compatible with my PC when I checked their requirements on the internet.

I first tried installing Prototype 2. I've checked the minimum requirements here:
http://www.game-debate.com/games/index.php?g_id=1327&game=Prototype%202
Installed and launched smoothly, but when the first scene comes up, it lags so much I can't even move my character properly.

Then I tried installing Assassin's Creed(the first one) here are the requirements:
http://www.game-debate.com/games/index.php?g_id=18&game=Assassins%20Creed
It's minimum requirements are a lot lower than that of Prototype 2, but I still have the same problem.

I have 4 GB of RAM and the drivers and DirectX are all updated. Please check these screenshots too for more information about my PC specs:
http://fc01.deviantart.net/fs71/f/2013/068/7/7/specs1_by_jrmcrlmorales-d5xflo0.jpg
and this one too,...
http://fc04.deviantart.net/fs70/f/2013/068/1/7/specs2_by_jrmcrlmorales-d5xflxi.jpg

I think it's something with the NVIDIA dirver settings, or the RAM. I've heard there's something in Windows 7 32-Bit limiting the usable RAM, the performance bad even if the game is actually compatible with your system. I'm not sure of any of these though so please help, thanks!

First thing I would do is check for infections. What security software have you got and have you scanned with it recently?

Skip infection checks... no way is that 8400 GS a gaming card. It is not anywhere near the min requ for Proto2...
http://www.hwcompare.com/7109/geforce-8400-gs-512mb-vs-geforce-gt-430/
But you have it; if you set the lowest graphics res your monitor can stand [640x] then you might get a playable framerate.
Might. It was only ever an entry-level card, was not as good as the card it was meant to replace.
"I have a new Windows 7 Ultimate 32-bit PC". New? I just checked, that card was new in 2007. Okay, it is this century, but you did well to find one. There should be no stock anywhere.

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