artem said:
which is better to use AVAST 4.7 or ZONEALARM PRO 6.5.7
ZoneAlarm Pro is for AntiSpyware and Firewall. It doesn't include antivirus. I think you are refering to 'ZoneAlarm Antivirus'.
avast! is better than ZoneAlarm Antivirus. It is very light on system and has good detection rates.
Go for this combination:
Antivirus: avast!(free) or KAV(Paid).
Firewall: ZoneAlarm Pro (disable Antispyware)
AntiSpyware: Counter Spy
IMPORTANT NOTE: If you are using ZoneAlarm Pro and avast! make sure you disable 'Network Shield' option in avast!. Else there is a conflict between ZoneAlarm Pro firewall and avast! network shield which may slow down the system.