If you are having difficult time with vectors or just simply want to illustrate what they mean than this software will help you for a long way. http://rapidshare.com/files/3346132/Vector_software_3d_and_2d.zip only 3mb but vectors in 2d and 3d can be drawed and calculated including scalar projection and many more. ive tested them so you should not have a problem by geting them into work any problem by installing or getting it to start just ask btw its two programs one in 2d and other on 3d. 30 days evaluation after that you can buy it if you want it. Bye.