unwanted programme

Hi I have norton 360 on my pc. I recently downloaded a programme which has introduced "Positive Find" which keeps throwing up pop up ads. I removed the programme  through control panel and rebooted my pc. The programme Positive Find is no longer showing in the control panel but the pop up ads are still appearing. I have run a full scan with Norton 360 and Norton power eraser. I am not good with computers so any help would be appreciated. ron