Do you also have the issue with the resolution set to 800x600? You can change this in the graphicoptions.xml file in

C:\Users\{username}\AppData\Local\Divinity 2 Demo\Profile\

for Vista/7 and

C:\Documents And Settings\{username}\Local Settings\Application Data\Divinity 2 Demo\Profile

for XP

It is a mistake to think you can solve any major problems just with potatoes.
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