Cojo, ZA has been known to cause errors and other situations , lots of the computers I have repaired has been cuased by ZA problems. I know that they have fixed a few of these issues from past versions, but I still seee it. Allthough I am a beta tester for Agnitum, outpost, I recomended it way before that came to pass to anyone. It is as easy, or easier than ZA as far as user interaction goes, and has many more features, on the surface, and behind the scenes, as far as superiority is concerned. As far as resouces go, it does hijack your computer as NAV does, its " True Vector " is a leech, and remains active even when shut down. And in many cases remains behind even when there is a uninstal of the product. They claim this has been fixed, yet I havent seen it.
In conclusion, if the FREE ZA is working for you, then keep it. But if your having, lock ups, slow shutdowns, or even programs forgetting past given yes or no permissions, the time may have come to get outpost. They also have a free version available that I have installed on many systems to date. Also, if you have a past current subscrition to other programs, you would qualify for a discount on the pro version.
If you ever decide to switch, make sure you treat the uninstal as you would NAV, go int ot hte registry and clean out out entries, look for hidden folders and delete them all.
Good luck to you sir,
Dan