after uninstalling Norton Security
with the Norton uninstall tool I've moved to the free version of zonealarm and the free version of AVG I have noticed that sometimes when my pc goes into standby the pc just hangs at the screen "preparing to standby"
I have to do a power cycle to reboot the pc.

Looking in the event log
doesn't reveal much.
If I turn zonealarm off I never experience the problem.
So does anyone have any suggestions on what needs fixing?

Operating System:Windows XP Home Edition
Software Version:
Product Name:ZoneAlarm (Free)