Hi, I suggest you to install BitDefender 60 Virus Scanner, that is a very quick and powerful scanner.
Then you can install also Auslogics Disk Defrag to improve the speed of your PC.
And another thing: add to your browser Collusion extension, which is a very important tool, because it allows you to know which websites are tracking you.
Then you can install also MPC-HC, that is a very good and fast media player.
For the rest, good config.