In the zone (look at the upper right corner of this window and have a look here :
http://eab.abime.net/faq.php?faq=vb_...ezone_faq_item), you'll find the latest stable WinUAE (WinUAE1610.zip). Try it with that and if that still doesn't work post your winuaebootlog.txt so Toni can have a look.