(Good luck on getting an answer from... SUPPORT?)
Since the game demo is so small, I would simply recommend completely unistalling and reinstalling.
Make sure your DirectX is updated AFTER the install. Just go to the MS site and find the update link for DirectX.
Also, there are multiple 'startup' links for the game. Before you do anything you may want to make sure you are clicking the right one.
The 'symptom' you mention usually occurs after you open the 'configurator' shortcut. Make sure you are clicking the 'Launch T-72' shortcut.
Be prepared to read the manual so you can tweak settings. This game is really 'green' in regards to optimization. You may need to do a little Google'ing, too.
Good luck (and try not to get frustrated).
BTW, taken from another post...
"BTW, aleader, support exists, and we’re regularly checking the forums, just not every day and even less so on weekends. For urgent support questions, we have a support email address under firstname.lastname@example.org.
(From an Administator... Moon.)
You might want to look around here to see what is mentioned about DivX, and in the manual, too. I believe you should have that 'current', also.
[ August 01, 2006, 07:31 PM: Message edited by: RealKill ]