NAS drive issue

So I picked up a WD My Book Live network storage drive. While the public share works fine and is currently enough to meet my needs I haven’t been able to get User Shares to work properly. Whenever I try and navigate to a user share I’m prompted for a user name and password (as expected) but I constantly get an authentication error after entering the credentials, even when I set up the account to not even require a password, I still get the prompt and I’m still denied. I don’t have much experience with network administration but this seems like it should be straightforward.

I’ve only tried accessing it with my desktop which is a Vista machine. I’ll try with my XP based laptop tonight. The DLNA worked which I’m very happy about.

No help on this? I can’t find anything on the WD help site, or any others really.