I have attempted unsuccessfully to install the upgrade. I keep getting the following message prior to actual installation:

Could not load the DLL library
c:\user\xx\AppData\local\temp\102308113249\vsutil. dll
The application has faile to start because its side by side
onfiguration is incorrect. Please see the application event log
for more detail

I have uninstalled prior version and cleaned up folders and registry entries and tried unsuccessfully to perform a clean install
Also tried in Safe Mode.
I do not have any other anti virus nor spam protection nor other firewall (Windows defender and firewall disabled)

Operating System:Windows Vista Home Premium
Software Version:8.0
Product Name:ZoneAlarm Internet Security Suite