So, I have this problem with some games on my PC. Basically when I look at grass, bushes, really leafy trees, or anything like that, there appears to be a grid of lines going across my screen where the foliage is. If I look around it almost looks like the leaves are moving a bit because I'm moving the lines up and down the screen. I first noticed it on a certain level in CoD4 without a lot of grass and thought it might be some weird issue there since I hadn't noticed it before but now that I'm playing Crysis I notice it a lot more. It's like the grid only shows up when I'm looking at foliage because lines seem to go across the screen, stop where theres open space or dirt, and then continue on another bush on the other side of the screen. Also, it's only like that from a distance. Up close its normal.

Anyway, I'll try to post a screenshot or small video to illustrate what I'm trying to say in case this isn't very common or I'm not making any sense but any help would be appreciated.

Oh and here's spec in case it matters.
GTX 280 SLI
Intel Core 2 Quad Q9550
4GB Ram
Vista 32-bit SP1

It could be artifacting from an overheated graphics card. I'll wait until you've posted a screenshot or video but its worth checking your graphics card's temperature.

Need a screenshot because your description could be a few things.

Sounds like what happens when a Xbox 360 gets a E74.

Also,  if I zoom in on some leaves it seems like the leaves get "thicker" and if I zoom back it out looks "thinner" and more pixelated. However, if I move closer to the tree the same distance the zoom simulates, it still looks like the first pic in each of these examples. The whole "grid" thing is hard to show in a screen shot as the trees just look like the first pic. It's not a blatantly obvious flaw unless I'm looking at the forests in Crysis moving the screen around....then all the foliage looks crappy. Also, not sure if it's related but the all the foliage brightness kinda flickers when I look around at nighttime.

http://s5.tinypic.com/xnsuw3.jpg
http://s5.tinypic.com/2q2irt3.jpg

and

http://s5.tinypic.com/984j1x.jpg
http://s5.tinypic.com/rt262d.jpg

Hard to tell on the screens though.

i can't see anything wrong in those images.....

Yeah, they look fine to me as well. :P

They look really awesome, I wouldn't complain :)

"Also,  if I zoom in on some leaves it seems like the leaves get "thicker" and if I zoom back it out looks "thinner" and more pixelated. However, if I move closer to the tree the same distance the zoom simulates, it still looks like the first pic in each of these examples."

This is because when you zoom in you are focusing down the scope. Crysis portrays this realistically by blurring out the background as you focus through the reflex sight. The leaves of the trees are made of a sprite with sharp edges that don't blur fantastically and as a result they can appear simply thicker instead of bluring smoothly as was intended. 

I'm struggling to see the grid of lines in any of those pictures though.

Yeah the lines can't be seen in a screen shot. They aren't weird colored lines. It's almost transparent white. It seems like the screens don't really do justice to what I'm trying to explain. Let's try again.

http://s5.tinypic.com/1zb9k5s.jpg

and

http://s5.tinypic.com/140fdll.jpg

The first pic, I'm standing still. The second one, I'm moving. Is there some setting that makes the leaves always look like the second pic? I like the fuller look of the trees. They seem too see through in the first one.

Ah, well it's not perfect but that did help a lot. Thanks Apex.