By enabling firewall, using a good antivirus, antispam, antimalware product on your PC and keeping it on all the time, you can achieve this.
Run a virtual machine using snapshots. You can always revert back to a previous known condition. Use the applications Jadeep recommends.
This is actually a hacking or cracking attempt. Unfortunately, it is not really good to do any cracking or hacking attempt just to possess your Windows or any other software. It is still better to purchase a licensed software for you to use all its great features.