See Through call 855-408-2226 Pop-up
When users see such a pop-up on Virtualpchelpdesk.com domain page, they can be scared and do as it orders to call 855-409-2266. However the so-called Rookit.Sirefef.Spy virus actually do not exist in their computer. Neither finding an anti-virus program or calling the number are incorrect actions.
This message can be seen on different browsers but show the same to every user. You should know it is offering a FAKE ALERT. This is a malicious ad which aims to guide users to call the provided number, so that it can promote some removal tools and services by chance. In another word, this number is a fake tech support line aims to cheat users out of money.