A few months ago I added a hard drive (SATA) to my computer that had been running XP and installed Win7 on it. Had it booting straight to Win7. Downloaded Easybcd to day and tried to set it up so I could boot to either Win7 or XP. Rebooted computer and now I have a black screen. I've tried to boot with a vista repair disk but it only goes so far and then hangs. My Win7 install disk won't boot because I have an MSI (older)motherboard. I used the Vista Repair disk to install Win7 in the first place. How do I recover from this mess?