The complainant also objected to the image not being able to be switched off while viewing TradeMe.
In response, Powershop said it did not consider it had breached the advertising code of ethics.
The point to the advertisement was to display evil figures in a different light, by performing an act of kindness and stabilising a ladder.
Also, because zombies were understood to be "undead" they could not be killed or, as in the advertisement, injured.
A few days after the complaint was laid, Powershop amended the ad to remove the falling hammer and screwdriver.
The Advertising Standards Authority found that because of the self-regulatory action taken by the advertiser the matter was settled.