Where's my second OS?

Hi all,just want to pick your brains,i have 2 Hard Drives in my pc,both have got Vista,well last night i had to reinstall windows on one of them and now when i boot up i dont see the option for choosing which one to boot to,any idea why? they are totally independent of each other so why would the dual boot option disappear?
Heres a few system specs in case they are needed,thanks to all who try to help in advance:wave Oh yeah only one of them is SATA.

--------[ EVEREST Home Edition (c) 2003-2005 Lavalys, Inc. ]------------------------------------------------------------

Version EVEREST v2.20.405
Homepage http://www.lavalys.com/
Report Type Report Wizard
Computer NICKS-PC
Generator Nick
Operating System Microsoft Windows Vista Home Edition 6.0.6001 (WinVista Beta)
Date 2008-11-20
Time 09:52


--------[ Summary ]-----------------------------------------------------------------------------------------------------

Computer:
Operating System Microsoft Windows Vista Home Edition
OS Service Pack Service Pack 1
DirectX 4.09.00.0904 (DirectX 9.0c)
Computer Name NICKS-PC
User Name Nick

Motherboard:
CPU Type AMD Athlon 64, 2400 MHz (12 x 200)
Motherboard Name ECS K8T800-A / KV2 Extreme
Motherboard Chipset VIA K8T800Pro, AMD Hammer
System Memory 1536 MB (PC3200 DDR SDRAM)
BIOS Type Award (04/29/05)
Communication Port Communications Port (COM1)
Communication Port ECP Printer Port (LPT1)

Display:
Video Adapter Radeon X1600/X1650 Series (512 MB)
Video Adapter Radeon X1600/X1650 Series (512 MB)
3D Accelerator ATI RV530 Pro
Monitor CTX EX950F Series [19" CRT]

Multimedia:
Audio Adapter Creative Audigy LS Audio Processor

Storage:
IDE Controller VIA Bus Master IDE Controller - 0571
IDE Controller VIA Serial ATA Controller - 3149
SCSI/RAID Controller Microsoft iSCSI Initiator
Floppy Drive Floppy disk drive
Disk Drive Maxtor 6L160M0 ATA Device (160 GB, 7200 RPM, SATA)
Disk Drive Maxtor 6Y080L0 ATA Device (80 GB, 7200 RPM, Ultra-ATA/133)
Optical Drive FREECOM_ DVD+/-RW20J6 USB Device
Optical Drive HL-DT-ST DVDRAM GSA-4081B ATA Device (DVD+RW:8x/4x, DVD-RW:4x/2x, DVD-RAM:3x, DVD-ROM:12x, CD:24x/16x/32x DVD+RW/DVD-RW/DVD-RAM)
SMART Hard Disks Status OK

Partitions:
C: (NTFS) 156327 MB (135861 MB free)
D: (NTFS) 78152 MB (55526 MB free)
Total Size 229.0 GB (186.9 GB free)

Input:
Keyboard Standard PS/2 Keyboard
Mouse HID-compliant mouse

Network:
Network Adapter VIA Rhine II Fast Ethernet Adapter (192.168.0.2)

Peripherals:
Printer Microsoft XPS Document Writer
USB1 Controller VIA VT83C572 PCI-USB Controller
USB1 Controller VIA VT83C572 PCI-USB Controller
USB1 Controller VIA VT83C572 PCI-USB Controller
USB1 Controller VIA VT83C572 PCI-USB Controller
USB2 Controller VIA USB 2.0 Enhanced Host Controller
USB Device USB Human Interface Device
USB Device USB Mass Storage Device