Office for Mac '11 question about install

[01ds650]

I've had Office 2011 for Mac for over a year now. It works fine....except it does this odd thing where opening certain types of files (not always office files) the instal drive icon will pop up on my desktop. Much like the icon for a flash drive does when plugged in. I just drag to trash then two weeks later or so it shows up again. What's that about?

Thanks guys

 

[AirThis]

Automatic updates perhaps? Which version do you have?

You should be on 14.2.4 if you've run all those updates.