Re: Samba and Windows 7
First verify user1 has access to samba. From the server try smbclient to test the user's credentials.
This should give you a command prompt where you can perform simple commands like ls to list files.
smbclient //fileserver/share -U user1
For more info check man pages.
Can you access the share without first trying to map the drive. What happens when you simply try to open the shared folder from Window 7 client?
Did you restart Samba services after making your changes?
Do you get any errors when running testparm?
Does your Windows 7 username match the username of a different samba user? Perhaps windows is sending your session username? Samba works well if your windows username and password match those on the samba server.
Nothing is ever easy, but if it is difficult you must be doing it wrong.