I should manually install ImageMagick to View images,Why?

[asm23]

Hi, my system is windows Xp, I'm using Lyx 1.60.
I installed the alternative installer. But I found that the image can't 
be displayed in any Lyx files.

I installed the ImageMagick-6.4.2-0-Q16-windows-dll.exe to solve the 
problem.

My question is:
The alternative installer said that it will install ImageMagick 
automatically, where is the imagemagick after installing? I can't find 
these files then.

Thanks very much.