Hi larilucena,

This now looks much better. Now it is time for you to preform upgrade from Windows 8 to Windows 8.1 and then to 8.1 Update.

Start Windows Store and preform upgrade from there … or start Windows Update and preform update from there … there will be several upgrade offers, accept all of them.

Install Windows 8.1 Update and when you done with all that updates and upgrades, then run again FRST tool and post me fresh FRST.txt and Additional.txt logreprot.

Btw, your USB devices are infected. Malware should be neutralized from the system so, remain malware is located on your USB devices. You have installed MCShield, keep it active all the time and you shall be protected from them.