Register a free account to unlock additional features at BleepingComputer.com
Welcome to BleepingComputer, a free community where people like yourself come together to discuss and learn how to use their computers. Using the site is easy and fun. As a guest, you can browse and view the various discussions in the forums, but can not create a new topic or reply to an existing one unless you are logged in. Other benefits of registering an account are subscribing to topics and forums, creating a blog, and having no ads shown anywhere on the site.
I used to use ZoneAlarm until it did basically what it did to you. ZA is a good (excellent!) firewall but something the developers did (I don't know what) caused this behavior in some cases. I now use Comodo as my firewall. It's free and 99% as good (in my opinion) as ZA.
I have used Zone Alarm, Nortons, and now I'm using Kaspersky. If you have AUTO UPDATES on they all do it at a different time during the computer start up. It varies from brand and year. Also it will vary according to your internet speed when on auto update. If you have internet security ( which ever one you use) set to scan at start up it will take longer. Some systems do this when set at default and most will give you a choice when loading them. I set mine to auto update and no scan, then go drink some coffee. Works for me.