Nothing in firefox displays properly unless in full screen

I started up my computer today and a norton window popped up informing me that a new version of the product was available. I went along with it and updated. Afterwards i opened up firefox to browse the web but instead of my home page i got a glitched out window. Rather than try and explain the look of it, ill include a few screen shots.
http://i.imgur.com/KuHcJeY.jpg
http://i.imgur.com/AKwXJU6.jpg
The look of the problem reminds me a lot of when a window freezes up or lags. Where it takes a freeze frame of whatever is behind it, and whenever it is moved off screen and then back it distorts the image like below.
http://i.imgur.com/vGbhNRu.jpg
Only usually everything within the program is frozen when this happens. Here, firefox seems to be working fine in the background. I can still click the "Firefox" button at the top and go through the options within, and i can type into text fields on the webpage, i just cannot see anything on the webpage. Firefox isn't freezing, it just seems to be a graphical error.
The weird part, is the fact that fullscreen works just fine. As soon as i hit f11, firefox goes into fullscreen and everything is displayed as it should be. But once i hit it again, it goes right back to the way it was.
I have hardware acceleration off already because of a previous graphical error i had, and as of now i have tried disabling webgl, updating my graphics card driver, reinstalling firefox, creating a new profile, reseting firefox to default, disabling EVERYTHING i could think of, and even messing with norton's settings.
Im thinking of uninstalling norton next to see if thats really what is causing it, and if that doesn't work, then im running out of ideas.
Im running Windows 7 Home Premium 64-bit with a Nvidia GeForce 335M Graphics card and have the latest (Obviously) version of Norton Internet Security.

Turns out the problem was with windows itself. When I updated my Norton, something went wrong in the install and in trying to fix it i only kept making it worse.
What ended up fixing it was me uninstalling norton completely and installing Win7SP1. I dont really know what the problem was or what really fixed it, but i have a feeling it had something to do with bad timing on the install.

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