[Q] enable usb debbuging in micromax funbook talk topic

I have a micromax funbook talk p350
Due to some reasons some file may got deleted
And it is stuck at funbook logo
I have all the softwares required to root it and to to install ICS
But it's usb debbuging is not on and cannot be switched on
Had tried hard reset but no improvement
Laptop can detect it's usb but doesnot regonise it
What to do ??please help!!!