I use it once a day.. ad-aware 2007, On my Vista machine with User Account Control (UAC) turned off, it is very fast.. completes a 320 GB Hdd scan in about 15 min.. but then again I am running a Intel Core 2 Duo 1.8 Ghz with 4 Gb memory..
I have the Startup service set to Manual and it only kicks in when I launch the application..
I have also used the application with the service stopped, but it will not update with service stopped, nor will it save settings..
So what I do is when I launch the application, I let it scan, then in Task Manager, I stop the service after the Application is closed..
No problems so far..