Win98 Network Guide!

[ila420]

Hieee ... Is it possible to restrict users of Win98 not to delete files from the Server ... like there are around 30 computers on the network most of them are runnin on Win98 .... now from a few days there is someone i mean a user who is deleting files from the Server which is runnin on Microsoft Windows Server 2003 .... Now on XP or Win2000 its easy to restrict user .... if i will give read only access they wont be able to modify the file or create a file in tht specific folder .... wht i want is restrict them from deleting the files .... Dont Delete option .... i really want to do this .... cuz changing operating system from win98 to xp or 2000 of around 25 computers will not be possible for me .... so kindly help !!