I'm having a similar problem while Running ZA Extreme Security.
I tried following some of the threads...I removed ZA with the removal tool link (I don't think it worked...) I forgot to do this step...Before you Uninstall your current ZA, UNcheck "Load ZA... at startup".
Now I can't get ZA to install properly or work at all! I tried to install the trial version of ZAES 3 times and still can't get it to work.
Please help, I'm so confused and frustrated...