How do I fix Mac OSX screen from going to vertical lines when on internet?

When going to the Internet my Mac will instead fill the screen with a field of tightly spaced vertical lines. It requires rebooting to get out of it. Anyone have insight on this?
I did run AVG cleaning last night
Model Name:    iMac
Model Identifier:    iMac12,2
Processor Name:    Intel Core i5
Processor Speed:    3,1 GHz
Number of Processors:    1
Total Number of Cores:    4
L2 Cache (per Core):    256 KB
L3 Cache:    6 MB
Memory:    4 GB
Boot ROM Version:    IM121.0047.B1F
SMC Version (system):    1.72f1
Serial Number (system):    D25FM196DHJQ
Hardware UUID:    ACBCC6E1-9494-5E04-B06C-22919C0E6A24
Report sent after crash:
Anonymous UUID:
47F7853E-AA01-033A-83C8-DC7A9ADA7CEA Fri Oct 3 11:10:55 2014 Machine-check capabilities: 0x0000000000000c09 family: 6 model: 42 stepping: 7 microcode: 40 signature: 0x206a7 Intel(R) Core(TM) i5-2400 CPU @ 3.10GHz 9 error

Please post a screenshot of the anomaly.
Due to a bug associated with this support site, image attachments may or may not appear. Try it anyway.
Screenshots (Mac):
To take a screenshot hold ⌘ Shift 4 to create a selection crosshair. Click and hold while you drag the crosshair over the area you wish to capture and then release the mouse or trackpad. You will hear a "camera shutter" sound. This will deposit a screenshot named "Screen Shot...." followed by a date and time on your Desktop.
When you post your response, click the "camera" icon above the text field:
This will display a dialog box which enables you to choose the screenshot file (remember it's on your Desktop) and click the Insert Image button. If you are not using full screen mode you can simply drag the image into the text entry field.
⌘ Shift 4 and then pressing the space bar captures the frontmost window.
⌘ Shift 3 captures the entire screen.
Don't capture or upload any information you consider personal. To edit an existing screenshot, read How to edit a screenshot.
Drag the screenshot to the Trash after you post your reply.

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