problems connecting to a network drive

I have a home network with a couple of PCs running WXP and one with Ubuntu. As part of the network I have a Hawkings HNAS1 network drive that I use to share files amongs my network . I have no problems accesing the network drive from the WXP PCs but from the one with Linux I can see the shared folder but when asked for user and password I get an error message "The folder contents could not be displayed".

This is the process that I follow to connect to the network drive: I go to places -> connect to server, a window opens in server type and I choose windows share, in server I type the IP address of the network drive with the shared folders, then in share I type the name of the shared folder ...then click connect and then it asks me for a user and password. Here is were I get the error message.

I get an icon on the desktop with the IP address of the network drive, when I double click I get a window with the icon of the shared folder that I want to access. When I double click this folder I get the next window with 'Authentication Required', here I type the username and password but cannot access the drive and get the error message. I have checked again the username and paswword with the WXP PCs and it works.

Any suggestions?

Appreciate your help.

Carlos