internet explorer

I wonder if anyone could help me, in the last couple of days when I have went on to internet explorer a pop up message has appeared,this is the message.
internet explorer
a website wants to open content using this program on your computer

this program will open outside of protected mode.internet explorers protected mode helps protect your computer.if you do not trust this website do not open this program.

                   name:avast anti virus
                   publisher: avast software a.s

could anyone let me know why this is happening all of a sudden and is there serious issues with my latop

name:avast anti virus publisher: avast software a.s
do you trust this program ;)

google internet explorers protected mode