Five0,
Are you definitely logged in as an "administrator"? If so - maybe you need to "run as administrator" when you install the drivers?
This should be straightforward - the drivers install, and they're available in SONAR.
Also - you shouldn't need to worry about routing. The MOTU manual says, when you're using a sequencer - just set it to prg 1 "sequencer 30fps" (with a button on th efront of the device) and that's it. SONAR will take care of your routing etc.
I've been using mine for so long - I forget about it - it just works. It worked in XP, then Win 7 and then win 8 (and 8.1)
I'm not saying this to annoy you - I'm just saying that this is *supposed* to be straightforward. Sometimes that helps to troubleshoot (ie I often say "I shouldn't have to be doing all this - let me check something more fundamental...")