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It's possible you have a program installed that interferes with Steam.
Read these FAQs:
Spyware, Adware, and Viruses Interfering with Steam
Disabling Background Applications
DirectX 10.1 includes DX 9.0c. You can't install DX9 because windoes won't let you downgrade DirectX.
Yes. it is.
I have Windows 8 with DX11.1. I never had to install DX9 to get any game to work. DirectX won't let you install a lesser version of DX over a newer version.
Then you did something wrong.
Enough though. This isn't helping the OP. I will not continue aiding in your mis-informaton.
Have you tried verifying the game cache? Is windows fully updated? Did you try to repair the Steam installation?
https://support.steampowered.com/kb_article.php?ref=6218-USFX-5568
There is a list from Steam on what you can do. Did you try them?
What specific games are they?
Read this: http://pcsupport.about.com/od/fixtheproblem/ht/directx9xp.htm
You just need to update directx.
I have freshly updated Windows 8 and I have installed all the updates and the latest drivers for my Graphics card. I installed the client before and after the refresh and reinstalled all the games. It made no difference.
My games are;
Batman Arkham Asylum,
Battlefield Bad Company 2,
Call of Duty MW 2,
3 Company of Heroes games,
Darksiders,
Frontlines fuel of War
Saints Row 3
Metro 2033
Red Faction Armageddon.
Some of them I bought recently on a humble Bundle but I played them all on Windows 7, I am not sure how to verify the game cache but I will have a look.
https://support.steampowered.com/kb_article.php?ref=2037-QEUH-3335