Windows Vista Help! Vista won't boot after trying to install XP on another disk!

I'm really worried right now....

I just installed an old hard drive into my computer to install XP on, so I could use it if I needed to.

I booted from my XP CD, formatted the drive, and started installing XP. (I'm sure I chose the right drive because it was a 10 gig and I chose the ~9000 MB one)

After the computer restarted, I had to reboot it again to tell it to boot from the HDD with XP to continue installation.

I have another disk that used to have XP on it, but got corrupted (but I can still access the files). It always tries to scan that disc, but it won't work, so I restarted.

I tried to boot from my Vista disk, (I think) and got some error. I rebooted again w/ the new XP install, but I wasn't able to skip the disk check (I need to remove the corrupt drive to pass it).

So I tried to boot into Vista (I know), and I get this error:

What should I do?

PS: I do NOT have a Vista CD (besides betas). Vista came loaded on this OEM drive.

 

Two KB articles:
http://support.microsoft.com/kb/919529/en-us
http://support.microsoft.com/kb/933179/en-us