Hi,i'm new guy here and i'm not sure if someone had this problem too, but i got huge problem with aiming. when i turn zoom on, red dot is moving like crazy. From the distance 50 meters i'm unable to shoot a big truck ( i try to blow up the car with fuel in second mission). Is this normal or something is wrong with my game or my PC.
What should i do?

The first thing to do is to search the forum for topics about aiming or any other problem, before making a redundant post. Take advantage of other people's work.

Having said that; aiming problems, according to other posts, are a result of having not enough memory ( you haven't posted your computer spec, so I'm guessing ). You should bulk up to at least 2 GB of RAM and your aiming problem should go away.

If memory serves this was an issue in the first GRAW on machines with less than 1GB of RAM.

GRAW2 never did it for me with 1GB though.

maybe it's in the mouse sensetivety...