Here's a link to a build of AVS. paste it into winamp / plugins like avs is meant to be.
https://dl.dropboxusercontent.com/u/94454272/avs.rar
I don't know if it will help maybe your problem already got solved but i figured this would be useful.
I don't know the version number, but it's the version i've been using for years and i've never had crashes or issues with it. Fullscreen works perfectly fine, in fact i've been able to successfully and consistently run desktop background overlay and i'm running win7 so i really don't get what all the fuss is about re. avs being unstable. Seems alright to me.
I hope this helps you guys achieve a good result. Enjoy!
https://dl.dropboxusercontent.com/u/94454272/avs.rar