Hi Gary,
Thank you for posting your question in the Microsoft Community.
Sorry to know that you that you are facing this issue.
Windows 10 is safer and more secure thanks to Windows Defender and Windows Firewall. When you start up Windows 10 for the first time, Windows Defender is on and working to protect your PC by scanning for malicious software.
Windows Defender uses real-time protection to scan everything you download or run on your PC. Windows Firewall filters info coming into your PC from the Internet, blocking potentially harmful programs.
I would like to let you know that Windows Defender is included with Windows and helps protect your PC against malware (malicious software). Malware consists of viruses, spyware, and other potentially unwanted software. Malware can infect your
PC without your knowledge: it might install itself from an email message, when you connect to the Internet, or when you install certain apps using a USB flash drive, CD, DVD, or other removable media. Some malware can also be programmed to run at unexpected
times, not only when it's installed.
Article for reference.
Protect your PC: http://windows.microsoft.com/en-us/windows-10/getstarted-protect-your-pc
Keep us informed to help you further.
