Goto the Start bubble and if there is no Run command shortcut there, type Run in the search box.
Run should appear at the top of the menu. Open that, and type in dxdiag in the new window, and click OK.
The DirectX diagnostics should display. Try all the tests and see if any errors are reported.
I recently installed windows 7 on my Dell Precision M70. I also Installed Halo(It has already been on this computer with XP before). When I start the game It gives me a message saying-A problem occurred initializing directdraw. I have already installed a new version of directX(DirectX 11) but to no avail. I cannot find a solution. Any ideas would help!