Win32/Heur?

I recently started getting a message from avg 8.0 on my laptop running vista home premium.


the alert reads as follows

threat detected!

file name: c:windows/mpcodecplg.dll

threat name: Virus found Win32/Heur
detected on open


details listed this:

process name: c/program files/internet explorer/iexplore.exe
process ID: 4368



this happens when I open a window I have the option to move to vault but after a stern warning stating that it will cause windows to become unstable it still occurs time and time again. Does anyone know what this is?
 
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