I successfully messed up Ubuntu. Now, I need to reinstall it. But Windows 7 is also installed on my computer, and it is the main OS. Now I booted up into the Ubuntu 13.04 installation DVD, and one of the options is to "Reinstall Ubuntu 13.04". I need to reinstall Ubuntu, but I don't want to lose my Windows 7 OS from the reinstallation. I just wanted to make sure and be clear that it is okay to reinstall Ubuntu*. Thanks!
*That is: Ubuntu will be reinstalled in the right partition from its previous installation, and my Windows 7 OS will take no harm.