SMB Permissions problem

I am having a permissions issue when Windows users logon to my Xserver running 10.5.2. Standalone server running AFP and SMB. Users can logon to the server using afp and access their files and folders in sharepoints they have access to. They can read/write and delete. However when they logon from a Windows XP Pro workstation using SMB they can no longer delete files or folders. They can still access the folders they have permissions for. They can create files and folders. But they can not delete files or folders. They get a message " Cannot delete filename; access denied;Make sure the disk is not full or write protected and that the file in not currently in use " I can logon with the same user from a Mac and delete. Has anyone seen this before?