hello there, if you ran the demo you should be able to run the full game, post your system specs, i guess you already try all this but here it goes.
update all your system drivers, make sure in case yuo have an ati, or nvidia card, to unistall them in control panel then reboot into safe mode and use a driver cleaner utility http://downloads.guru3d.com/download.php?det=1655
then install your new drivers, also make sure you have the lastest dx files
http://www.microsoft.com/downloads/details.aspx?familyid=2DA43D38-DB71-4C1B-BC6A-9B6652CD92A3&displaylang=en
gl man
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