I am looking in to Google Webmaster Tools - Crawl Error section.

How should I handle for those URL due their system / application showed invalid URL.

e.g

http://www.example/images/products/s_=enlarge_16gb.jpg

but, I dunno what happen to yahoo groups, it break the link into

http://www.example/images/products/s_=
enlarge_16gb.jpg

and I only make the top part become hyperlink, which is

http://www.example/images/products/s_=

Because of the URL, Google show crawl error, I got few error because of this kind of result or because other people typo error.

How do I prevent this. I am sure I don't have the right go and change other people post. What is the solution for this.

Thanks!