Windows 7: Vista, Ubuntu and Windows 7

I recently formatted my laptop (Asus F8) which got it back to a Vista OS. I then installed Windows 7 to Drive D and installed Ubuntu which ended up along side Vista in Drive C. I'm stuck because all I wanted was to have Ubuntu running as my primary OS and Windows 7 as the secondary, but now I'm stuck with 3. I placed Ubuntu in drive C because there's a bigger space. Any suggestions on how I can take Vista OS out of Drive C so that I can use the rest of the space for Ubuntu only?
If there's no work around then, I'm willing to start over. Like reinstall Ubuntu first before installing Windows or something?
Another problem is that I can't boot into the demo of Ubuntu to install the whole thing so I keep getting stuck with the dual boot. :|
Anyway, thanks in advance for the help. As you guys all probably know by now, I'm a real noob at this.

Have a look at this tutorial:
Dual Boot Windows 7 and Ubuntu