Your embroidery program could be doing it to you. If everything works as it should other than that little problem I wouldn't be to worried.
The Windows Defender that you have on your computer came with your Windows 7. When you installed Microsoft Security Essentials it turned off Windows Defender just like it was designed to do. Just for your knowledge. Windows Defender
that came with your computer is very different than Windows Defender Off Line
. Both made by Microsoft but work in a completely different way.
The names are very close in wording and many get them confused. If everything comes out clean after scanning with MSE I think you will be okay. If by chance you just want to know more about Windows Defender Off Line you could read this. >Windows Defender Offline<
Happy embroidering and Happy computing.
PS. If you have any question and or problems someone is always home here 24/7/365.