It is possible your recovery disk may not have the repair options a normal Vista OS disc would have, but you can give this a try:
1: Insert your Windows Vista Install DVD and boot from it.
2: After selecting your language options choose the "Repair your computer" option in the bottom left corner of "INSTALL WINDOWS" window.
3: In "SYSTEM RECOVERY OPTIONS" window, select your Windows Vista Installation and continue
4: At bottom of "SYSTEM RECOVERY OPTIONS" window, Open a new Command prompt by selecting "Command prompt"
5: When command prompt is open, type the following commands:
The MBR/Boot Loader is now repaired, restart your computer and it should boot into Vista.
If this does not work, try this