Can somebody please tell me why hacker or whom ever is trying to take over my computer?
It tell you that Window's defender has a virus. They want you to call a number in other to get back into your computer and tell you not to turn off your computer. I shut my down and started a full scan on my computer. What I want to know is, why and how
did these bad people get pass firewall?
See Beware
of Phony Tech Support Scams
https://www.microsoft.com/en-us/wdsi/threats/support-scams
Did you close the browser (using Task Manager if necessary)? Often that will eliminate the issue. Occasionally you may need to just do a hard shutdown (power off) and then restart the computer. When you open the browser
again do NOT restore the previous browsing session.
Any new browser extensions that need to be disabled/removed?
You may want to scan with the Emsisoft Emergency Kit (a free program): http://blog.emsisoft.com/2015/06/09/how-to-find-and-clean-malware-infections-with-emsisoft-emergency-kit/
Other scanners that may help with this issue are listed in List
of Malware Removal Tools
For issues with "tech support scam" popups while using Edge see theAnswerof GreginMich dated
June 20, 2016: http://answers.microsoft.com/en-us/protect/forum/protect\_other-protect\_scanning/1-888-2361-scam/0990122e-61a9-431b-947e-a904c202fa7c
More detailed information on this continuing issue may be found in the January 2, 2017 Answer of GreginMich in https://answers.microsoft.com/en-us/protect/forum/protect_defender-protect_scanning/microsoft-virus/5335f80f-4cfc-49e0-bbcf-8f575730779a.
For issues with Google Chrome see How to stop unwanted pop-ups or homepage
changes in Chrome, and How
to reset Google Chrome settings. You may want to use https://www.google.com/chrome/cleanup-tool/
If you cannot resolve this issue see this free multi-step removal guide from Malwaretips.com: https://malwaretips.com/blogs/remove-tech-support-scam-popups/
You may not need to use Hitman Pro (available if needed as a 30 day trial) but you may need to reset your browsers.
https://malwaretips.com/blogs/reset-internet-explorer-settings/
https://malwaretips.com/blogs/reset-chrome-settings/
https://malwaretips.com/blogs/reset-firefox-settings/
http://www.howtogeek.com/237527/how-to-reset-microsoft-edge-in-windows-10/
Regards...
http://blog.emsisoft.com/2015/01/27/top-10-ways-pups-sneak-onto-your-computer-and-how-to-avoid-them/