Install the latest Microsoft Security Essentials definition updates - Get the latest definitions - Microsoft Malware Protection Center
[Microsoft Microsoft Security Essentials 1]
Definition updates available here:
http://www.microsoft.com/security/portal/Definitions/HowToMSE.aspx
Silent installation:
32-bit: mpam-fe.exe -q
64-bit: mpam-fex64.exe -q
At least that way you can have a relatively up-to-date install from the start.
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