What is iv_nt86?Once in a while I see an icon in my toolbar saying that it's downloading iv_nt8

Can anyone tell me what is this?Everytime I have been cancelling the download.I am using Etrust antivirus from CA.

What is iv_nt86?Once in a while I see an icon in my toolbar saying that it's downloading iv_nt86.?download

It is an incremental virus definations update from eTrust Antivirus.