Thanks,
I read that post and all the list of replays, however although i used avast on my old machine and it was the best AV i know,
now i am experiencing a lot of problems caused by avast.
my system:
new PC (desktop), new HD everything is new and blank.
windows 7 home premium legal version installed.
NO previous AV installation of any kind.
NO firewall except windows ever installed or activated.
NO other rootkit or any other security feature except windows, ever installed on this machine.
At windows firewall avast is recognized (i checked it).
I installed the latest version of avast 4.8.1368
the problems:
Avast doesn't run at all or doesn't run security checks, once even the folder scanning didn't run.
No automatic updates - from time to time it works manually - i already checked automatic at program settings.
Explorer process has a lot of crashes since i installed avast.
To my opinion there is a conflict between avast and some feature\s of windows 7 security center or vice versa.
if there is a solution for this problem i will appreciate it, since i want to use avast.
Thanks again