Wasapi & asio
Hi,
I couldn't get ASIO working (I tried for months using XP) I switched to Vista and straight away got WASAPI to work with very satisfactory results, so I have given up pursuing ASIO.
My advice would be that if ASIO is working, and if the sounds it produces agrees with you, then go with it. The forums are full of claims and counter claims about which is best, and if you were to chase each of the discussions it would drive you nuts. One of the claims I have seen is that the quality of ASIO drivers can vary, and therefore the sound can too. I'm not sure about that, but what this claim does do is increase uncertainty and encourage more time spent searching around for the 'ideal' solution. That may suit you, or may just add to your frustration. I am very lucky in that I am getting the sounds I want, and believe it or not am now able to sit back and enjoy music sourced from my laptop (Laptop is W7, Desktop is Vista), so for me WASAPI is the bees knees. My (prejudiced) view is that if you have W7 or Vista, WASAPI is the way to go. 1 hour spent trying to configure it could be an hour well spent. If you get it to work, then great, if not then go with ASIO.
I haven't looked into your error message (busy at work and only dabbling on the interweb for now), but if I uncover anything I'll get back to you. If you want to dabble and try and get WASAPI working, there are good discussions on sites like Head-Fi, computeraudiophile and others, but enter at your peril - they get quite heated sometimes.
Apologies, I haven't been able to offer direct help, only views based on my own conclusions. The best advice I can offer is to let your ears tell you what's good, and if they're happy, stop fiddling, listen and enjoy.
Regards,
Bob