Z-Quest is adware that adds advertisements on the top and bottom of web pages viewed with Internet Explorer. It is installed by trojans, without the user's knowledge or consent. There is no visual indication the adware is running on the system other than the additional advertisement banners.
Based on the settings of your F-Secure security product, it may block the file from running, move it to the quarantine where it cannot spread or cause harm, or ask you to select an action.
Z-Quest adds banners to the top and bottom of some web pages viewed with Internet Explorer. The banners can be very difficult to distinguish from banners designed to be on the web page. Example with Z-Quest banner
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