A decent security suite normally consists of three elements, all of which you can get for free anyway, so there's little point paying for anything.
Firstly, you need a firewall. Windows has its own built in, so many people are happy to use that. However some people regard it as less secure than the free offerings from either Zone Alarm
http://www.zonealarm.co.uk/security/en-us/zonealarm-pc-security-free-firewall.htm
or Comodo
http://personalfirewall.comodo.com/
Then you need anti-virus software. The free version of AVG is exactly the same as the version as you're paying for, so that would seem to be an obvious option for you:
http://free.avg.com/gb-en/homepage
However I've found that AVG can slow my (elderly) computer, so my own preference is for Avast:
http://www.avast.com/index
Comodo's free antivirus software is also highly rated
http://antivirus.comodo.com/
(Note that you should only ever have ONE firewall, and ONE antivirus program, running on your computer. Using multiple products can lead to system conflicts)
Lastly, you need an anti-malware program. While there's no free product that I know of that 'runs in the background' (as many commercial products do, but often slowing your computer in the process), the free version of Malwarebytes Anti-Malware serves most people's needs (by simply running a scan perhaps once per week):
https://www.malwarebytes.org/antimalware/
(When installing it,. take care to deselect the option to take a free trial of the 'Premium' version).
With those three elements in place, there's no point whatsoever in paying for a security suite.