Hi robertcarl,
Malwarebytes's did remove some nasty items. The two you mention in your posts CKVO.exe and now the Dc8.exe both appear to be game related in some way.
Dc8.exe is from GameSpyArcade
GameSpyArcade can be installed when you install a Game.
A lot of games now give you the option to install GameSpyArcade
Older Games did not give you an option and GameSpyArcade was installed without your knowledge. While the CKVO.exe also has been called, from what I could find,
Trojan.Win32.Vaklik.cdj
Trojan-PSW.Win32.OnLineGames.rxtk
Trojan-GameThief.Win32.OnLineGames.sitj
Now as far as your Norton showing as expired, as long as you have all the information regarding this...your current registration number and such, you should be able to uninstall it and reinstall it without purchasing a new copy and the expiration date would be restored. But we will get to that shortly, as long as it is still working right now let's leave it there and continue to be certain the computer is totally free of infection before doing that reinstall. You don't want the reinstall possibly damaged by anything still remaining.
I would like you now to do the following;
Download ComboFix
Click on the Save button and then when it asks you where to save it, make sure you save it directly to your Windows Desktop.
Once the download is complete you will see the Combofix on the desktop.
* Close all open Windows including this one.