(By the way, u will need to download a thing if you havent tried this site before, it will just ask you if you allow it, just press "yes" and then continue)
1: Google "Can you run it"
2: Press http://www.systemrequirementslab.com
3: Write in Crysis 2 at the upper field
4: Press can u run it
5: Wait until the website gathers your information (here should be the DL phase if i remember correctly)
6: Now you can see how good your computer will work with crysis 2
Please write down in this thread how your computer did!
My own computer was furthest to the right at the scale(Which means "Best"=wont have problem with Crysis 2 at all)