Virtually ALL my customers use
- Microsoft Security Essentials on Windows 7 and
- Windows Defender on Windows 8.x and Windows 10.
A really BAD bug has been uncovered that warrants your immediate attention.
Please follow the instructions in this article or alternatively you can do the following:
- Open Windows Defender (MS Security Essentials on Windows 7)
- Click on the Update tab
- No matter what the program says click on the big button Update Definitions