Read how to use System Rescue CD to wipe your hard drive clean with zeros at another post in this forum, here -- http://www.tomshardware.com/forum/237379-50-ubuntu-windows-issue.
Once the hard drive is wiped and formatted, download not ubuntu, but peppermint One, for your laptop. It should be a great fit for your system, I would think. And it uses not only ubuntu repositories, but its own and, many times, mint repos, too. Download it here -- http://peppermintos.com/.
Have fun and stop pirating things that will get you in trouble!