When (re)formatting a machine with a new operating system, put comodo.com's progam manager on first thing. Then, install comodo firewall. (ALWAYS choose the option to route all traffic through comodo's servers.)
After that, install comodo dragon (google based) browser or comodo iceDragon (firefox based.)
All of this means your browsing traffic will go through comodo's servers which will provide the best maximum protection available online.
Use bitdefender or Emsisoft.com antivirus