messenger live

Hello you all,
as a new user here, a question:
I was a Norton user and switched to Avast. But in Messenger Live there is still Norton as my virus scanner…How could I change this?
If I try to do it, I got stuck at the moment what to choose to open AVAST as my scanner

Have you fully uninstall norton? Try download the norton uninstall tool over here http://service1.symantec.com/Support/tsgeninfo.nsf/docid/2005033108162039

yes, I did…and I used the Norton utillity to do so

Can you change Messenger settings?
If so, point it to C:\Program Files\Alwil Software\Avast4\ashQuick.exe

ok, will try so

Please, post back the results.