How to restart dnscache service

i am using Windows 10 Pro Fall Creators Update x64

i have tried restart dnscache service but it gives me error even though i did run command prompt as administrator.

this is frustrated because i don't wanna clean reinstall OS

here things i tried:
sfc /scannow: no corrupted system files found
SeaTools: hard drive self test passed
CrystalDiskInfo: healthy
Avast free edition: no threats found
Malwarebytes Premium 14 free trial: no threats found

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also i have downloaded from: https://www.grc.com/inspectre.htm to double check and making sure if still i'm protect against Meltdown and Spectre

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