bsnl modem-zxdsl 831 aii usb driver installatiion

when i try to install the usb driver for this bsnl modem it gives an error "error loading newdev.dll" hence i tried replacing with a new newdev.dll but still the problem exists. and another message that appears is "Need administrative privilages for installing hardware drivers" eventhoug im the administrative user of my system.
Somebody please help out please!!!!!

completely uninstall all the usb drivers for this modem.
2. Now without connecting the modem download the driver to say
C:/My documents /ZTE USB drivers.
Now connect modem to Usb Port of computer.
Restart.
let windows
detect New Hardware and ask for drivers.
Possible: may be rejected as "digitally not signed by MS"

BSNL MODEM DRIVERS
looking for a driver 4ur BSNL usb Broadband modem,EVDO & WLL phone modems bsnlbbmodemdrivers.blogspot.com

i installed bsnl driver successfully on linux and all versions of windows. i cannot post all steps here... Visit the link below for details visit this website "windroinux " (search this word on google, then first post on that site)