Ok try this.
The master HD is the 10 gig and the computer boots 2 it first.
I asume the 10 gig is connected by a pci cable and the 160 gig is sata.
If so enter the bios and there is definition of the sata. It depends on your mother board how on it is called. There u can change the setting from raid to ide. this way the windows will recognize the hd from the instalation. If u cant find it then on the disk that came with the mother board u can make a floppy disk. In the cd is a folder called setup or sata and u need to coppy the contense of this file to a floppy. then when u boot from the win cd and it sais on the bottom press F6 (I think) to boot from raid press F6. then it will tell u to enter the floppy and hit enter then it will continue.
It should now recognize the 160 gig HD.
Before u repair windows try following this link it tells u how to fix ntldr missing I found that it works in 95% of the casseshttp://www.computerh...es/ch000465.htm