Number : 18009179841
popup : hxxps://s3-us-west-2.amazonaws.com/pop0402145/chrome/9841/index.html
popup may lock browser, I leave javascript disabled to prevent this so I wouldn't know.
The number is working as of now in skype and firertc, they claim to be microsoft and there is no switchboard so call flooding would be possible.
another popup :
popup : hxxp://microsoftsupport.com-windowsfix33.us/
Number : 8882346534. the popup won't show if you visit the link directly, you have to use a typo of youtube. here's a screenshot because I can't attach photos because something went wrong. http://imgur.com/a/jRHta
It's IYogi btw.
I suspect this one will do a browser lock too as it asks me to enable javascript.