Unreal Editor is not starting up!

Hi. I have been struggleing to start unreal editor, but i failed, no matter what i did.
Whenever i hit new project>c++>create project i get a compilation error.

Running D:/Epic Games/UE_4.18/Engine/Binaries/DotNET/UnrealBuildTool.exe test2 Development Win64 -project=“D:/UnrealEngine/test2/test2.uproject” -editorrecompile -progress -NoHotReloadFromIDE
Performing full C++ include scan (building a new target)
Creating makefile for test2 (no existing makefile)
@progress push 5%
Parsing headers for test2Editor
Running UnrealHeaderTool “D:\UnrealEngine est2 est2.uproject” “D:\UnrealEngine est2\Intermediate\Build\Win64 est2Editor\Development est2Editor.uhtmanifest” -LogCmds=“loginit warning, logexit warning, logdatabase error” -Unattended -WarningsAsErrors -installed
Reflection code generated for test2Editor in 7,5054813 seconds
@progress pop
Performing 9 actions (4 in parallel)
[2/9] Resource ModuleVersionResource.rc.inl
[3/9] Resource PCLaunch.rc
D:\Visual Studio\VC\Tools\MSVC\14.12.25827\INCLUDE\cstddef(7): fatal error C1083: Cannot open include file: ‘stddef.h’: No such file or directory
ERROR: UBT ERROR: Failed to produce item: D:\UnrealEngine est2\Binaries\Win64\UE4Editor-test2.dll
Total build time: 12,87 seconds (Local executor: 0,00 seconds)

What could the problem be?