Microsoft Security Essentials provides real-time protection for your home PC that guards against viruses, spyware, and other malicious software.
Locate your architecture type next to the System Type line.
Download the Microsoft Security Essentials virus and spyware definition update file that is appropriate for your version of Windows, as follows: .
When the definition update file runs, a file extraction dialog box appears.
The dialog box indicates that the definition update is installing.
It couldn't even sync my clock with the default internet server!