Avast 6 - communiqe after installation

Hi I have windows 7 x64 home premium and yesterday I installed the latest version of avast free 6. After a quick check disk I saw window with the message: “Do you want make a full scan at startup system?”. I installed already the same version of this program at other PC and this message I didn’t see. Why I saw this message?

http://www.centrumxp.pl/Img/Art/WindowsXP/Porady/Ochrona_wirusy/02/pyt.jpg

Hmmm… I cannot read your language, but are you sure this message comes from avast?

It says does he want to scan after installation on restart.

Myślę, że Avast jest prośbą do jednego skanowania po instalacji, by sprawdzić, czy masz złych na komputerze.
Jestem pewien, że to nic martwić.
Myślę, że po prostu wydała najnowszą wersję Avast.

Was it 4.8 that used to prompt you for a scan on reboot after installation before entering Windows