I can give you my information.
I am also have this issues.
My computer is a custome built machine,
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System Information
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Time of this report: 12/12/2013, 12:40:08
Machine name: ATLAS
Operating System: Windows 8 Enterprise 64-bit (6.2, Build 9200) (9200.win8_gdr.130531-1504)
Language: English (Regional Setting: English)
System Manufacturer: System manufacturer
System Model: System Product Name
BIOS: BIOS Date: 07/17/12 17:51:21 Ver: 14.03
Processor: Intel(R) Core(TM) i5-3330 CPU @ 3.00GHz (4 CPUs), ~3.0GHz
Memory: 32768MB RAM
Available OS Memory: 32718MB RAM
Page File: 5534MB used, 59952MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 11
DX Setup Parameters: Not found
User DPI Setting: Using System DPI
System DPI Setting: 96 DPI (100 percent)
DWM DPI Scaling: Disabled
Video Card: Radeon HD 7970
The game itself has "Full screen selected" but it stays windowed.
The Error I got (once, it showed up the first time but not any other time)
"A program running in the background is preventing Dragon Age II from being in ful screen"
Something to that regard.
