NW65SP7+ZfD7. Xp_sp2Rus.+NWclient4.91.4

USer: "utemp" log in to the NW server and in to the XP (mamber of the local
- From the FireFox(or IE) open page: http://server/ipp
- select printer (user have right on this printer), press Enter and have
error: not defined driver for this printer...
But, if log as: admin in to the NW and this XP (admin - mamber ob the
local Administrator group) - all OK. Can normall add ipp printer..

Why this ?

Please, help me