Issues mapping network drive with Win7 home premium

I am trying to map a network drive at work, we just bought new laptops with Win7 home premium. With XP when we mapped a drive we put in the address, it asked for a user name and password and bammmm theres the drive. With Win7 I put in the address of the drive, then the username and password and it come back with password not correct and there is a domain name in the username. WTH is up with this, I want to map a network drive that we use at work, how can I get rid of this domain name thing when mapping the network drive?

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