That error screen is the same one I got when we first started using Qt 4.4.3 . Qt 4.4.3 has some changes to the graphics interface and requires new drivers for the video screen. This happened in October last year. Check that you have the latest (post October 2008) video drivers.
Also if you are using Vista you may need administrator priviledges to write to some areas of the computer. This also produces the same error screen.
Barry
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