It sounds as if your homepage has been hijacked. Run an Anti-spyware programme and see what it finds. If you have Windows XP you can download Windows Defender from Microsoft.com. If not try AdAware which you can find if you google it.
What is ransomware and how do I protect my PC from WannaCry?
What I learned from my mentor, Oscar-winning VFX supervisor Phil Tippett
Siri vs Google Assistant
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.