I have configured samba share as follows
comment = Drive for PC 1 path = /home/meta/PC1 writeable = yes valid users = meta, pcone guest ok = no read only = no write list = @pcone browseable = yes create mask = 0775 directory mask = 0775
The user "meta" has admin access and while "pcone" is a standard user. The problem is that the files and folders created in Ubuntu have proper group "read/write" permissions but the files/folders created from Windows 7 does not have "write" permissions for the group. Please note that "meta" is also a member of "pcone" group.