FINISHED

So Friday we couldn't make heads or tails as to what we were supposed to do to reinstall the GRUB, as it kept coming up with errors. So we just reinstalled Ubuntu. :D And it worked! Took about 15 minutes.

After that, we installed Beta Win7 on the second partition of the second HDD, and voila! Triple boot!

We just turned on our computer and checked it, and everything works. Yay! :D

WE'RE DONE.

EDIT: Ok, so apparently our triple boot doesn't work quite the way it's supposed to, so we're going to go back tomorrow and hopefully fix it. *crosses fingers* But it still works. <3