If you aren't able to find scanner in your computer, follow these steps to find scanner in your windows pc(computer).
#Type "scan" in your windows search.
#you will see scan app on search results.
#below "Open" option, there is few more options, like pin to "startmenu", "pin to task bar" etc..
#Click on "pin to task bar" to get fast access your scanner from task bar(bar row at the bottom of window).
#Now click on "open" to select your scanner and connect it as your default scanner.
#And you are done, starting fast scanning by just clicking on scan on task bar.

All steps are shown in screenshot, below.