Friend, I believe Windows will serve you well. However you may try Linux in order to improve you user experience. The good news is that dual booting is extremely easy to do so, is nothing complicated and it will not give you headaches or anything, let me cover some poinsts:
Firstly, you mentioned Linux would prevent you from gaming and using other apps. Well, thats half true. Linux will not prevent you from "other apps". Any app you want to use has an equal in the Linux enviroment, and for free. Computers have evolved. As a matter of fact, Linux has a button to a "download center", you just type what you want and you get it installed. Its that easy. BTW, the same can be said for Mac OS, you wont miss anything on the "Apps" side
However, you gonna have to acess Windows in order to play games. It has to run natively. If you virtualize it, you will spend system resources on it, and you will not have a good gaming experience.
Now, I have to point to the fact that in order to browse safely on a windows enviroment you dont necessarally need a paid anit-virus. As long as you browse safe sites, email, facebook etc, you are fine with AVG or Microsfot Security Essentials. However, if you do plan on acessing "suspecious" sites, then you need a paid option. Or you may go with a diferent OS, wich are safe for the moment, but its seems like that will change in the future as these OSs are getting more and more popular.
You know what, you might do good with simply windows and a free anti-virus. However, you may dual-boot for the experience of tasting another OS. Its extremely easy, specially if you are running Windows and will install Linux:
1)From Windows, go to Linux ubuntu website and download the "installer". Run the program. Simply click yes on everything. When the PC reboots, it will automatically give you a dualboot screen for Windows and Linux. Its that simple. Its impossible to screw up.
2)Linux is straightforward to use, as long as you are not small minded. On the left side there is a "similar task bar" wich have all the apps. That includes a giant Firefox button and a giant Word processor button. Its impossible to miss.
So you have the options available to you, its your choice. GL