I tried to install SQLServerExpress 8.
Having double clicked the download file, there was a lot of disk activity, but nothing else.
I expected some sort pop up from Account Control.
After
10 minutes waiting,
I closed down ZA & immediatly I got a response from the setup program.
There seem to be lots of post on this sort of thing, and all seem to point to odd or spurious scans.
The file was 500M, and if it was being scanned, thats a long time

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