gta 4 crashes after putting new textures on police vehicles

Hello!

Today I found the OPP Stealth Tahoe ('?do=embed' frameborder='0' data-embedContent>>) and thought that I would make a simple black paint with licence plates from the province that I live in.

After importing the new textures over the old ones (Tahoe sign 1,2,3,4)

My game crashes upon start up. And it didn't crash prior to the new textures. I also used the same textures with a different model (http://www.mediafire.com/download/j864nt86qnbn9gr/SPD+Template.rar) but it still crashed.

i know how to texture vehicles. I'm not very good at getting creative but i know that u need a template, paint, Photoshop, the textures need to be .png and 2048x2048 or something like that.....

Anyways, any help would be appreciated. 

i can attach the textures if it would be any help. All you have to do is ask :)