Windows 7 + Asio 4 all

hi to all, i need help this same problem hapened to me and my friend who has the same PC, What happens is that i tried to install asio for all in windows 7 RC (my pc is a Amd 3000 1.5 Ram, sound blaster audigy LS, geforce 6200) and when i select Asio output in any aplication It doesnt seem to work, you dont get any sound, im tired to look aronund and goggle my problem And Nothing.
An important fact is that a few month ago I was using Win XP ( the one than came on the pc) and I had no problem.
Im Lost.

- Do I need any Special configuration in w7
- is there another free alternative to asio 4 all