avast updater

i had a problem about avast updater. i always make avast uptodate, but why when avast downloading virus definition and if i open a new window (for example mozilla or my computer) my avast updater became disappeared, and the virus definition isn’t installed on my computer.

(i’m sorry my english is bad, i’m indonesian)

Is there a blue icon pop up on the right down of the screen?

my avast updater became disappeared
Is that what you mean that the avast blue icon disappear? If yes it is normal,If no than i dont understand whats your problem