WIndows 2008 share folder

HI, My office have setup win 2008 server to share some folder for our users .

I have created some user name in 2008 server, and user using XP/win 7 , then can access the folder without any problem.

But one Win7 computer don't have any password for login, when I try to Map the server folder ,it prmpt to 'it must need a password for login'.  (name = TOM,but no any password)

Is it have any way, I can use a Empty password to login for this user and use the share folder? ( I no need the anonymous/Guest login)

because at Windows 2000/2003, I can use those user access the folder without any password.
thanks