OK, this is driving me crazy. I have Zonealarm installed on two Windows 7 64bit machines. On both machines it seems like I install Zonealarm and then come back in a few days and notice, no more Zonealarm?! What can I check to troubleshoot this? For example on this machine I first notice because there is no icon in the system tray. But I don't see any Windows warning. I do find an entry C:\Program Files (x86)\Zone Labs\ZoneAlarm but the only thing there is a log file with this contents:

*** Installation Started 06/17/2012 23:21 ***
Title: ZoneAlarm Extreme Security Installer
Source: C:\Users\Andrew\AppData\Local\Temp\GLBA456.tmp | 06-17-2012 | 23:21:24 | 71680
Made Dir: C:\Users\Andrew\AppData\Local\Temp\061712232132
User Rights: Admin

Are there other Windows or other logs to check? Of course I am worried this is a security breach.