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установить последний Derect x

It's a common misconception that Win7 has only DX 11. There are three versions of Direct X and Win7 has them all. The vast majority of software and games still use DX9.
Unfortunately the pundits at Monopoly$oft left some of the DX9 files out of the Win7 installation.
This has caused much confusion, and Web Installer will often install the missing d3dx9 .dlls's.
Did you get a message that your DirectX is a newer of equivalent version ?

The following is a list of the Direct X .dll's you will have when the files are up to date.
Go to the Windows / System 32 folder, (and SysWOW64 if you have 64bit).
They are in alphabetical order and will start with d3dx9 - 24 > 43 . Then d3dx10 - 33 > 43 & finally d3dx11 - 42 > 43.
There should also be - d3d9, d3d10 and d3d11 these come before the D3Dcompilers - 33>43.There are also three new XInput1 - 1>3.
There are more DX files, but these are most of the graphics related Direct X .dll's

If you used the 'Web Installer' with no success then it may help to use the full Direct X Redistributable download installer .exe , as this will (I believe) overwrite the original Direct X files replacing any that may be corrupt.
The Web Installer only installs new files and does not overwrite the old ones.
After using the DX Redistributable run the Web installer again to update DX with new files since June 2010.

Download Details - Microsoft Download Center - DirectX Redist (June 2010)

Sometimes it helps to install Direct X from the Redistributable installer when booted into 'Safe Mode' .

Reinstalling the game sometimes helps.
Some games look for a d3dx (9,10 or 11) .dll in the games install folder. If you know which Direct X file the game is looking for (example - d3dx9_35.dll ) you can make a copy from the one in 'System32' and place it in the games install folder.