I have read thru these threads and tried, on my Acer Vista laptop:
1. Uninstall/disable Windows Defender;
2. Uninstall/disable Windows firewall;
3. Cleaned out all remnants of systems Symantec Antivirus;
4. Uninstalled ACER's eData file

still.....when I try to install the free version of ZA firewall, my pc locks up and has to be powered off, or it stalls on installing at "copying file" with this displayed below that title, and above the progress bar,

What else can I try...this is driving me nuts and I am about to throw this POC laptop out the window!

Operating System:Windows Vista Home Basic
Software Version:7.1 (Vista)
Product Name:ZoneAlarm (Free)