The ad could of been on a hacked website, a legit ad server was compromised or there is some adware on the computer.
If you haven't scanned for adware and malware I suggest you use the programs below to clean, remove adware and remove malware.
Use CCleaner to remove Temporary files, program caches, cookies, logs, etc. Use the Default settings. No need to use the
Registry Cleaning Tool...risky. Pay close attention while installing and UNcheck offers of toolbars....especially Google.
After install, open CCleaner and run by clicking on the Run Cleaner button in the bottom right corner.
CCleaner - PC Optimization and Cleaning - Free Download
- download Malwarebytes to your desktop.
- Double-click mb3-setup-1878.1878-184.108.40.2069.exe and follow the prompts to install the program.
- Then click Finish.
- Once the program has fully updated, select Scan Now on the Dashboard. Or select the Threat Scan from the Scan menu.
- If another update of the definitions is available, it will be implemented before the rest of the scanning procedure.
- When the scan is complete, make sure that all Threats are selected, and click Remove Selected.
- Restart your computer when prompted to do so.
- The Scan log is available throughout History ->Application logs. Please post it contents in your next reply.
Download AdwCleaner by Xplode onto your desktop.
- Close all open programs and internet browsers.
- Double click on adwcleaner.exe to run the tool.
- Click on Scan button.
- When the scan has finished click on Clean button.
- Your computer will be rebooted automatically. A text file will open after the restart.
- Please post the contents of that logfile with your next reply.
- You can find the logfile at C:\AdwCleaner[S1].txt as well.
- download Junkware Removal Tool to your desktop.
- Shut down your protection software now to avoid potential conflicts.
- Run the tool by double-clicking it. If you are using Windows Vista, 7, or 8; instead of double-clicking, right-mouse click JRT.exe and select "Run as Administrator".
- The tool will open and start scanning your system.
- Please be patient as this can take a while to complete depending on your system's specifications.
- On completion, a log (JRT.txt) is saved to your desktop and will automatically open.
- Post the contents of JRT.txt into your next message