Valve Anti-Cheat Problem

if i do this,i need to do it every time i want to play cs:go

Used a hack and looked at comments everybody says its undetected i used it and got banned after a game dont trust anyone ppl

Was it external?
What injection method did you use?

Steam Library -> CSGO -> Right-Click -> Properties -> Verify Integrity of Game Cache.
If that doesn't work, go to Program Files (x86) -> Steam -> steamapps -> common and DELETE the Counter-Strike: Global Offensive Folder completely.
Then go your Steam Library -> CSGO -> Delete Local Content...
and then install the game again.
Please hit 'Thanks!' if I helped you!