Autorun on Sandisk flash drive

I inserted a SanDisk Cruzer 16 GB flash drive in my Win 8 laptop, and a window opened that had the Sandisk logo and it said installing Sandisk files or something like that, with a progress bar that took about 20 seconds to move across. It was not the pop up bubble you generally see by the tray when a driver is being installed, it was larger and in the middle of the screen. It seemed like some sort of autorunning application, which I thought Windows 8 does not allow. I don't see any Sandisk application in Programs and Features. Any thoughts? Thanks

Could be autorun INDEXING the files on your pen prior to opening the option dialog pop up .
I have the same exact pen, it has no propietary soft , its plug and play.
However if you need to change the autorun feature on your system just read here:
How To Disable AutoPlay & AutoRun In Windows 8