What is really important to understand is, many thousands of people, well most everyone playing LFS, can load the cars. So it is very likely that you have a software or hardware problem occurring. LFS itself is very solid.
On the rare possibility that there is a LFS bug of some sort causing this issue then we can only resolve it by testing and sharing information.
How big was the file you downloaded (LFS S2 W, not the W patch, but the full W version) please?
Did you install it into a new folder?
Do you have spare room on your hard drive for the Windows swap file?
Are your graphics and sound drivers good? Try new ones or roll back to an older one to test LFS.
What are the specs of your PC?
What other programs are running at the same time as LFS?
Is your PC clean (no malicious software)?
What resolution and refresh rate are you attempting to use (in LFS)?