There are problems with both luki19979 and mscathy's suggestions.
The ISOs mentioned will still require that you have a valid license for the software. You can't just download the ISO, install it, and expect not to need a product key. Well, I suppose you can, but you'll be disappointed.
Migrating an OS is also not really an option for the same reasons I already listed. First off, you have a completely different set of hardware, so the drivers will be causing problems. Secondly, you still have the legal issue of the migrated OS being unlicensed, or pirated.