Asking for Password when open shae folder

Dear All
I have windowes server 2003 i share some folder and give to Read permission to Everybody. But now when they access this server it ask for User name and password (From workgroup Computers) when User’s login to Domain it Don’t ask Username Password
Previously from Both(Workgroup and Domain)and password
and Now i can’t see Doamian system in My Network places when i login to Workgroup also when i login to domain i can’t see Workgroup system

plz help Me
mail me at
kumbharamol@gmail.com