Ms security essentials not updating
One important thing is to download the correct definitions for your system’s architecture: 32-bit or 64-bit.
Once you grab the setup file you need, just double click on it and follow the on-screen instructions to apply the latest definitions to Microsoft Security Essentials.
And if you are on XP, simply, double-click on the file and click OK.
The installer contains the complete, up-to-date anti-malware definitions for Microsoft Security Essentials, deploying the scanning engine (mpengine.dll), along with other files, such as mpasbase.vdm, mpasdlta.vdm, mpavbase.vdm, mpavdlt.vdm,