i've dell vostro 1500 - NEW and today when i log-in my yahoo messenger, my laptop immediately gave me error message as in the attached picture.

please help, suggest. thx in advance.

The picture is too blurry to read. First uninstall and reinstall Yahoo Messenger. If the computer continues to crash go to C:Windows\mindump and use Winzip to zip up 4 or 5 minidimps and attach them to this post so we can narrow down the source of your crashes.