Haven't tried this on Vista or XP, but, this NAS dongle works great with samba on Windows 7 Home premium - but, ONLY after a registry FIX, which I managed to find on the net.
If you don't put the reg FIX in, then Windows 7 won't let you Log in to the NAS shares - even after entering the correct username and password for it.
Below is how to make the reg FIX. Resort to it ONLY if yours doesn't work properly with Windows 7.
Make a new text document in Notepad, and enter the following lines,
Windows Registry Editor Version 5.00
Save this as a reg file - extension "NASFix.reg" (without the quotes).
All you have to do is double click on the resulting reg file to enter it into the registry.
Works great for me, but I take NO responsibility if something goes wrong while doing this.