(XP Home Edition)
I made a mess trying to change security from Zone Alarm to Comodo - ended up with Avast.
The changes ( the initial try of Comodo) triggered a 10 second intermittent 'siren' from inside the unit (standard - not laptop).
I've tried every kind of removal, reinstall, reboot...
audio
avast
comodo
console
device manager
hardware issues
intermittentsound
pc maintenance
reinstall
remove
security
sound card
system sounds
system update
tech support
troubleshooting
user experience
volume control
windows xp
zonealarm