[Samba] Regularly being asked for username/password

[JBornhoft]

I'm a bit of a noob w/ samba and I set up a small samba shar (v. 3.4.0) 
on my ubuntu machine which hosts a shared drive for a single vista 
laptop (my wife's machine).

My question is .. is it normal for her to regularly be asked to enter 
her username and password or is it something that I've done in my 
configuration.

Note: I used the configuration guide from Linux Journal (Nov/Dec/Jan).

Many thanks in advance!


J