Hell it even saves the system after being infected, I am told this by 2 friends and my brother.
No. Once a System is infected you cant trust it anymore no matter what you do. There are many FUD (Fully Un Detected) viruses out there that cant 100% surely be found. You dont know if the found virus has infected the machine with some of these. Its a big red flag that this option is available in kaspersky. Save your data and set up a new system is the only correct, nearly 100% save option.