Can't boot Vista completely Options

[Mikeplyts]

Hey, um, I'm in a bit of a pickle. So, about four or so months ago, I decided to install Ubuntu Linux on my computer. It's been a great OS so far and I've gotten pretty used to it, but I wanted to check out some things on Windows Vista (which was the original OS I used before Linux). However, whenever I booted Vista up (on both /dev/sda1 and /dev/sda2) it doesn't really ever boot Vista completely. Like, if I boot on /dev/sda1, it takes me to a big Vista image with a bar underneath that reads, "Recovering Windows" and then, it just restarts my computer and never "recovers" anything because it just shows the same image and bar again when I go back to see if it was actually "recovered." If I try it on /dev/sda2, it takes me through some options and stuff like that to recover Vista, but I've tried all options and none seem to work because when they "repair" the "problems", it restarts my computer and it still doesn't work (it just shows the exact same repair options again and again).

I'm not sure what to do so it'd be nice if one of y'all tech-nerds helped out on this one. And I don't know if it counts for anything, but I boot Linux/Vista from something called GNU GRUB.