Unreal Engine won't launch Error code (0xc000007b)

I install the epic luncher and downloaded Unreal Engine and it downloaded successfully but when i tried to lunch it that error appears and i tried to re-install directx but the problem was not solved
any suggestions other that reinstating the engine ?
thank you
and here is my log.txt
link text

HI Ali Tsaiev,

Could you also post your dxdiag (system specs) as well?

Windows: Go to the Start menu and type ‘dxdiag’ into the search bar. Open that file and then click ‘Save All Information’. Post that text file here.

ok here it is and sorry for late
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From your dxdiag it looks like you do not have Windows Service Pack 1. That update us required in order to run the editor. Could you try installing it from the Microsoft website and let me know if it fixes the issue or not?

can you give me the link please ?

Hi Ali Tsaiev,

We haven’t heard back from you in a few days, so we are marking this post as resolved for tracking purposes. If you’re still experiencing this issue, please try the suggestion we discussed and then post back here.

Cheers,

TJ