Windows 7 not booting from Ubuntu 12.10 boot menu

1. Am having windows 7 in one hard drive.


2. I installed Ubuntu in second hard drive.


3. Am configured BIOS to boot second hard drive first (Ubuntu OS).


4. and then i updated grub, so its shows windows 7 in the boot list.


5. I can boot in to ubuntu, but i can't boot into windows 7, its shows error A disk read error occured Press Ctrl+Alt+Del to restart .


6. then am configured BIOS again to load windows 7 first, it shows windows 7 and ubuntu in the boot list, windows 7 is working, but i can't boot into ubuntu..

Help to solve this problem.. i want dual boot from any one of the drive...