Ghostantivirus.com is a malicious website that promotes the rogue anti-virus application called Ghost Antivirus. Three other domains are involved too:
These websites have the same IP: 18.104.22.168. If you constantly see one of these malicious websites that means either your PC is infected with Ghost Antivirus or a particular Trojan virus. Anyhow, you should downlaod an anti-malware application and run a full system scan. For others we just recommend to avoid these websites because they may automatically infect your computer. Stay safe!