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I have installed Avast! 4 Home Edition.
I have followed all instruction but the blue ball icons don’t appear on my system tray.
The program is working?
I’m protected?
:-[Excuse for my bad English… :-[
Thank’s a lot
Welcome to the forums, monypa! Your english is good. 
First, tell us what OS your computer has as the answer sometimes depends on this.
I’m using Windows XP…
Ok, first let us try a repair of Avast as the program may not have installed properly. This happens sometimes with software on different computers.
Click on Start > Settings > Control Panel > Add or Remove programs.
Select Avast anti-virus on the list > click on Change/Remove > scroll down to Repair & select repair > click OK and follow directions.
You must be on-line to do this. Once finished, reboot and see if the blue ball icons appear in the system tray now.
If not, please come back and post here again.
If all is now OK, please come back and let us know.
I hope this helps you.
ok! I try it
when the system started, there were a symbol with 2 round arrows (red and blue) but this is vanished.
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That is the Red and Green arrows indicating avast is checking for updates once complete is vanishes.
Do you have any other anti-virus (or did you have) installed, if so which one and how was it removed ?
Do you have any other security software that may stop items being added to the startup folder ?
As a work around you can run the C:\Program Files\Alwil Software\Avast4aashDisp.exe file, you could create a desktop shortcut so you don’t have to find it each time.
You are protected as the ashDisp.exe (system tray icon) is just a user interface.
I have removed McAfee because I didn’t like it.
Now I’m using Zone Alarm Pro and Lavasoft Ad-Aware SE Professional
The Lavasoft Ad-Aware SE Professional may be your problem, I believe that can trach and block changes to the system/startup entried, a little like TeaTimer in Spybot Search & Destroy.
Check and see if that is the case, if so temporarily disable that function, uninstall avast, reboot, reinstall and boot.
monypa … be sure that you have removed every single thing about McAfee. It’s un-install program often leaves much behind and this could also interfer with any other AV working correctly on your computer.
No, I’m not sure to have removed every track of McAfee…
I will search…
Now I’ve run C:\Program Files\Alwil Software\Avast4\aash\Disp.exe and it work.
Tank you for your help but now I can’t do any “experiment”
See you tomorrow for update…