Windows NT4.0

Hi,
I am having a HDD of 1.2GB with Two partitions of 500MB(C:) and 720MB(D:), each of them is having FAT16 File System.
Now I had installed WinNT4.0 on D:(720MB) and C: is free(NO Operating System).
The machine is booting fine in NT.
Now,further i installed Win98 in C:(500MB),
So I was expecting that machine should show me 3 options for selecting one of them for making machine to start, i.e it should show me WinNT4.0,WinNT4.0(VGA Mode),and Windows.
But it its not happening at all, instead machine is directly loading Win98.
I want the modifications to be done for getting these options. please guide me.
thanks