I cannot get into Windows anymore after Ubuntu install!!! (PLEASE READ THE QUESTION DESCRIPTION)

PLEASE READ THIS PART BEFORE EVEN THINKING ABOUT CLICKING THE ANSWER FIELD.

OK, so first of all some information about my computer:
Dell Dimension E521
Windows XP Media Center

So, earlier today I was on the computer after a kinda crappy event that happened after school, and I figured I better occupy my bored self with something to do. So, I decided that today I would finally check out Ubuntu. So I go to the website (http://ubuntu.com for those who may be interested), follow the instructions, and then I put the disk into my computer and start installing it (after playing with it, of course). So, I chose English as my language, then I chose "Install beside it" or whatever the first option was. Basically install it along side Windows or Mac OS or whatever. So I chose that, selected my external hard drive (couldn't select the internal one for some reason), then clicked next and it installed.

However, before doing all that, when I went to install Ubuntu I hibernated Windows since booting it takes so long.

That was apparently a mistake. Becsue now when I turn my computer on, it goes straight to Ubuntu. I've tried every single option pretty much in the boot menu (if there is a way to fix this in that menu, do tell me :D), I played with the BIOS, but no matter what, I can't get into Windows. Now if I go into Ubuntu's "Finder" app, and click my windows partition, well the following error pops up:

That's all the details I can give for now. If someone could PLEASE help me that would be GREATLY appreciated. My plan was for Ubuntu to just be an option when I want to try something different than boring Windows or Mac OS. But it seems that plan failed. Sorry if there are too many horrible grammar errors here. It's 2:37 AM and I'm actually going to bed right now becsue I didn't realize how late it was.

Seriously though, if you can help, that would be AWESOME!