I have an Asus laptop (K53SV) and I would like to reinstall a clean version of Windows 7. However, the laptop came with Windows preinstalled, so I didn't get any disc. I tried the recovery option during booting but that only gave me the option to restore to a certain restore point, which only go back till January whilst I have this laptop 4 months now. Or I could also restore to a recovery image, which I also do not have. Now, how to reinstall my OS?