it may be related to WinDefender signature update
http://www.dslreports.com/forum/r22955014-mpasbasevdmtemp-malware-or-fp
http://answers.microsoft.com/en-us/protect/forum/mse-protect_updating/mpasdltavdm/63d01661-fec4-4a0d-a5d4-8daa62ca6718