1. If you are using a browser, carefully review your browser settings, such as the history, to see if any of them have been changed.
2. Run a virus scan to check if any malicious software has been installed on your computer.
3. Carefully check for any recent downloads or installations.
4. To reduce pop-ups, make sure the pop-up blockers in your browser settings are enabled and set correctly.
5. Install a reputable security program that offers ad-blocking.