Thanks for the screenshot.
Avast! does keep track of many processes and files many users are not aware of, which is a great feature of the real-time protection avast! has.
As both Steven Winderlich and DavidR say, avast! is notifying you of a pending system change you otherwise would not be aware of and giving you the option of blocking that change until you can investigate it further.
Think of it as a way to keep some sneaky b******ds out and not installing in your system without your knowledge.
Googling the specific file (you have the file name in the screenshot), find the link that leads to Dell, and you should be able to find out what it is.