Hey Dona. What is your main purpose of making this purchase? Do you use PC for work, gaming, writing, blogging, Data Research, Online Streaming, etc? Because there are several plugins and software tools available that can help you out. For example, if you are addicted to Netflix and would always want to have access to all the movies and sites that are blocked in your region, you can buy a paid vpn subscription for sure. Although there are several renowned vpn providers out there, but here is the list of best vpn providers for windows. I personally use PureVPN, as it is the cheapest and fastest of them all. However, as far the desktop security is concerned, then to be honest there is no such software needed to protect your offline data as long as you are not being a victim of cyber-hacking or spoofing. So just relax and buy a secure and trusted vpn for your PC.