In case that you suspect of an infection in your site, or even after you got rid of a malicious code, it would be better if you re-install all the plugins installed in your site, including the ones you are not using (aka. deactivated). Select from the list bellow the plugins you want to reset (it is recommended to select them all), be aware that premium plugins will not be re-installed.

I understand that this operation can not be reverted.