How to remove Safefinder, Snapdo and Websearch?

Hello,

After many scans with my antivirus and adwercleaner, it turns out that my laptop it's still infected by websearch, snapdo and safefinder and it really annoys me because each time that I try to to surf on Google Chrome, I find myself face to face with commercial ads promoted by Safefinder or an automatical open of advertising tabs which block my computer and makes it slower. Or, a modification of my initial by Websearch or Snapdo.

I hope that someone can find a solution to resolve this problem because nobody has mangaged to resolve it on french CCM.

Thanks in advance !