Bootcamp

Which version of Windows are you hoping to run? If they're supported by Windows XP, I'd recommend that because it uses the least system resources. You can remove the BootCamp partition later using the same assistant that you use to make it, and no this doesn't harm your Mac files or operating system.

 

I recommend the following rules when deciding on a Boot Camp partition size:

1. Allow 10-20 GB for the OS + updates
2. Then, add the maximum installed size of all applications, including temporary files
3. Finally, add at least 5% padding

As an example:
I'm installing Windows 7 Ultimate 64-bit. That needs 15 GB free space to install in, plus some space for updates. We'll start with 20GB.
I plan to use MS Office 2010 Home and Student on this Windows installation. That needs 3 GB of space, plus room for documents and updates. Add 5 GB more - total is now 25 GB. That's all I need Windows for.
Finally, add 5% padding. 25 * 1.05 = 26.25 GB. Rounding up to the nearest gigabyte, that means my partition should be at least 27 GB.

 

It's easy to do - the Boot Camp Assistant will offer to remove the Windows partition after Boot Camp has been set up (obviously, you have to be booted into Mac OS X first). No, anything on the Mac side will be unaffected.

 

I have the same laptop, install xp is better idea than window 7 if you just want to play game, there is no harm about it, so dont worry

 

I'm not too sure, but I dont think it can tho. When u install window on, the mac run slower in my opinion. Also Crisis requires massive of Ram, i guess 8Gb.
You can try to run the game in the lowest performance but it will still be low fps.

 

http://www.notebookcheck.net/Computer-Games-on-Laptop-Graphic-Cards.13849.0.html
of course firsthand knowledge is always better

 

I'm not too sure about it. Because I have 4Gb Ram, I tried to play Prototype which require only 2Gb on Xp. Even I reduce everything to the lowest setting, it still wont run smoothly. I dont know whether it is because of my Mac or what.

 

i say 65gb+ for your Windows Partition