ImageCreateFromJpeg problem loop in apache under win

Hi. I'm using php 4.3.0 with apache on winxp pro (gd2 bubled version). I'm writed a script that receive an uploaded file and if it's a jpeg move it in a directory for later use. All goes right but if the uploaded jpeg file is corrupted in some case the function ImagecreatefromJpeg don't return any error and apache process start run at 100% of the cpu end the script don't stop even after max execution time. what's the problem? any ideas? thanks *FbN**