Okay so my issue is this, in the last level of crysis my game always hits like 2 frames per second and then crashes, EVERY single time, and only at the fight with the big spider thing on the ship. Mind you my entire run through the game i played at max settings with not a single bit of lag at all period, so this tells me theres gota be some issues with the game its self and maybe a official fix for it or something.

All my drivers are up to date, ive tried re-installing 3 times, I've tried re-starting that entire level. I've searched online for 3 days now, and tried every single thing I've found on it with no luck still.... It's such a tease to know im right at the end and just seconds from seeing the end of the story and cant get there. Is there anything you guys suggest me trying that i haven't already did.

heres my specs
Windows 7 ultimate
ATI Radeon HD 4800 series
Intel(R) Core(TM) i3 CPU 530 @ 2.93GHz (4 CPUs)
4 gigs of ram

Oh and I should add that i have the Steam version, purchased through steam its self not retail Box/CD

I had a similar issue a couple of years back. All was okay, the very first time I played Crysis. No crashes or BSODs from start to finish, and this was on XP32.
I later upgraded to XP64, and decided to play through Crysis again, via the 64bit version. Again, all was decent from start to finish. In fact, I'd go as far as saying that I found the 64bit version smoother.
It was after I'd left the game for 6 months, then decided to play-through again, that I experienced BSODs. They'd happen fairly randomly, and the performance had taken a hit as well.
It really suffered in the battles after defeating that 'hunter' alien (big spider thing). I couldn't figure out why at first, especially since it was the same installation, which worked all those months ago.
I tried re-installing; checked all my drivers and directx version, but the BSOD issues persisted. I then decided to test my RAM using Memtest. Basically, a diagnostic app, loaded outside the Windows environment, to test memory modules for faults. Sure enough, I found faults in 2 of my RAM sticks. I returned them and received replacements, and BSODs vanished.

My advice, try running Memtest to check your memory modules for faults !! If you're not too familiar with it, the website is here...
Memtest - Downloads

I'm not saying this will solve your problems, but it's a useful tool to have, and couldn't hurt to try