I do not have win7 right now. So I'm guessing what the problem might be. I have a version with some more output ready. I send you the link. Please check it and let me kniw if the win7/API issue is fixed.
Lyra2Rev3 comes if I have these bugs fixed. Will try to get it ready as soon as possible. Which coin do you want to mine? Which pool? I can then develop with that mind and make sure that this will work.
Thanks.
Nicehash pool