To remove the file delete permissions

Hi

my requirement is give the share folder to the user with file modify permissions but they will not delete the files

I have tried the following way

create the share folder and given the modify rights and in the advanced permissions i have removed delete options. screen shot for ref

my problem is in windows xp user can able to modify the files and they can't delete those files, but the same thing not working in vista and windows 7 for the same user it giving access denied error

note: in windows xp its creating many temp files at the time of file modification

how to do this kindly help me