chucky

Hi, I wanted to solve a question; I admit, well, yes, I checked the illaegali file and I drew a virus, I scanned with 2-3 antiviruses that failed miserably, including kaspersrky, so I had to format the PC, unchecked the personal file; now because the antivirus has not found any defect, what must I do to repair these problems without formatting ??? I swear that I will no longer download any suspicious files from the network.