My screen "pulses" when events happen in the backround. How do I stop it?

I was installing a lot of new software on my including Norton anti-virus, Adobe CS2 and other programs. During the install (I think it was Norton Anti-virus), a wierd control panel appeared asking if I wanted the screen to "pulse" when anyting was coming in or going out. I recall testing the effect, decided I didn't like it and went on with the install.
I did not realize that I set the effect in motion. Now I have this pulsing screen and it is annoying. Now, I'm unable tof ind the lost dialogue box or anything in the system preferences control panels that will address it.
Can you help me figure out how to get rid of this?

Hello,
In System Preferences, under Universal Access --> Hearing you can set or turn off a flashing alert. Perhaps this is what's causing your problem.
If its only affecting Norton then I can't help, sorry.

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