access denied to a file on 2003 directory

I changed the permissions to a group "students" on a directory (the directory is mapped as a drive) on a 2003 windows server in order to  limit the permissions of users. so they only have read and excute
I changed  again permissions access (write to students) to the directory/files but when I try to write to the file ,- login from an XP pro station as administrator and acessing the 2003 directory, I get "can not create t.log  make sure the file name and the path are correct " although looking at  the effective permissions I see full control on the directory and on the file
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check the share permissions on the shared folder (on the share tab, permission from properties)
default in win 2003 it's read permission only
you have to add change or full control

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Windows Server 2003

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