Apparently I am not the only one having issues with the new Zonealarm update.
Installed it today and started noticing playback issues while watching video files from my hard drive. Audio would crackle and drop in and out. If I disabled Zonealarm all issues would disappear.
In addition, the longer Zonealarm ran in the background the worse the problem got and the more unresponsive the computer became. At one point it took over thirty seconds for a window to come up.
Using Q9450 cpu and Win XP Home Edition.
Uninstalled upgrade and reinstalled previous version and all problems have disappeared.
If someone discovers the problem please post it and I will reinstall upgrade. But at this point it slows the computer to a point as to be essentially unusable and unresponsive.