hello
I have the last version of Avast… 4.7.892 and i can’t launch the program for make a scan (when i launch ashAvast.exe my processor run to 100% but nothing run)
All the others functionalities are OK…
i have xp sp2, comodo firewall and zerospyware Free edition on my computer. (but if i closed this programs avast don’t work better!)
(sorry for my English!)
and thanks!
Welcome to the forum 
Did you try right clicking on the Avast icon and click on Start Avast Antivirus and try to scan your computer from there?
Did you try right clicking on your C Drive to scan it ?
Al968
Thank you for your answer
1/ Did you try right clicking on the Avast icon and click on Start Avast Antivirus and try to scan your computer from there?
Yes I made it and it is the problem there: when I want to launch the program via a right click, he does not dash!
2/Did you try right clicking on your C Drive to scan it ?
It works I have just thrown(launched) a scan… i wit the results and i hold you informed…
This is a Comodo bug reported before.
Waiting from Comodo staff to solve it…
http://forum.avast.com/index.php?topic=25287.msg207204#msg207204
I have not saw!
Merci beaucoup! 
Never mind… welcome to avast forums 8)