That's a ton of work to do over fishy advertisement.The decades-old mantra sounds like it applies perfectly:
1. Close computer, wait 30 seconds and reboot.
2. Clear cache, flush DNS, kill cookies....
3. Update virus definitions, run MWB, CCleaner, run Panda online virus scan, run AdAware
4. And don't respond to messages from generous or just instantly wealthy Nigerians just grateful to be alive wishing to impart their fortune on strangers
5. If you're using a phone for a computer then WhatsApp may have hacked the security.