Why was my screen fading to white?

So I got my MacBook two years ago. After about a year, my screen started slowly fading to white and acted slow out of nowhere. The recent times I used it, my screen no longer turned white but it was still so slow. I went ot the Genius Bar recently (which is absolutely great!) and the one who helped me said that I had an anti-virus program, Symnatec that slowed down my programs because it checked if there was a virus in everything I did. He deleted the app for me and he suggested I upgraded to Mac OS X Mountain Lion but my RAM was at the bare minimum of 2GB. So I went to a computer place in the city where they could add more. I upgraded to a 3GB RAM and upgraded to Mac OS X Mountain Lion. My quesstion is, why did my screen fade to white but then stop out of nowhere? Will it happen again? Please let me know ASAP! Thank you!

PRAM
A small amount of your computer’s memory, called “parameter random-access memory” or PRAM, stores certain settings in a location that Mac OS X can access quickly. The particular settings that are stored depend on your type of Mac and the types of devices connected to it. The settings include your designated startup disk, display resolution, speaker volume, and other information.
SMC
Fans
The computer's fans run at high speed although the computer is not experiencing heavy usage and is properly ventilated.
Lights
The keyboard backlight appears to behave incorrectly (on Mac computers that have this feature).
The Status Indicator Light (SIL) appears to behave incorrectly (on Mac computers that have an SIL).
Battery indicator lights, if present, appear to behave incorrectly (on portables that use non-removable batteries).
The display backlight doesn't respond correctly to ambient light changes on Mac computers that have this feature.
Power
The computer doesn't respond to the power button when pressed.
A portable Mac doesn't appear to respond properly when you close or open the lid.
The computer sleeps or shuts down unexpectedly.
The battery does not appear to be charging properly.
The MagSafe power adaptor LED doesn't appear to indicate the correct activity.
System Performance
The computer is running unusually slowly although it is not experiencing abnormally high CPU utilization.
Application icons may "bounce" in the Dock for an extended amount of time when launched.
Applications may not function correctly or may stop responding after being opened.

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