New Threat ? NIS 2011 and 2012 freeze on file in WINDOWS\assembly\NativeImages folder

This file causes NIS ( both versions )on QuickScan and Full System Scan, Windows Backup, Malwarebytes, to all 'freeze' when it gets to it..........

c:\WINDOWS\assembly\NativeImages_v4.0_3039_64\System.Xml.Serializ#\59e70022e798ce28f9f5b8870c5c8bf2\System.xml.Serialization.ni.dll...............

 

Anyone have any thoughts as to a solution ?