Internet explorer virus - resets internet options and keeps opening new tabs and searches

Whenever I try to use the internet a new tab keeps opening that to search using the current search engine, searches for a string of characters and says nothing found. This then opens 3 or 4 times and then stops until i try to access a website again then recommences. This seems to be processed by internet explorer. On checking internet options all settings are at the minimum level but whenever i reset to medium or higher and reboot these are reset but as soon as i go to the internet they are automatically reset to minimum. I have run virus and malware scans but cannot repair -any suggestions?

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