I have had ZA installed for years and keep updating it.
On any given day I will have the need to allow Windows Vista run services.exe, spoolsrv.exe, or svchost.exe.
Even though I check the "do it forever" box to allow these to run, I may get the same popup one or more times. In particular, every time I run Dreamweaver, I have to "allow" svchost.exe to run--even though I click the forever box.
It seems this just started happening a few months ago.