Hi Sumam
Let's next make sure your XP isn't configured to block unsigned driver installation.
> Rt click My Computer->Properties->Hardware
> Click Driver Signing button
> If it is set to Block, Windows will block the installation of any digitally unsigned drivers. Is it set to Block?
If it is Block, we need to change it. Set it to either Warn or Ignore and check Make this action system default. Then click OK close all the windows and reboot
In any case, let me know what you found