Garry's Mod got infected!

My GMod got infected with a virus. I had to delete HL2.exe but I don’t know how I can reinstall it?
This happened when I went out of HL2, and played GMod, I got a D3D failure, restarted my computer. Later AVG warns me that garrysmod/hl2.exe was infected, I deleted it, then I tried starting it and I get “The game is currently unavailable, please try again later”
I need help :frowning:

EDIT:
My game won’t start up. It doesn’t crash on startup.
I get.
“Preparing to launch Garry’s Mod…”
Then comes up that annoying DINGDINGDING!
“The game is currently unavailable. Please try again later”

do this

didn’t work :frowning: I still get the message
“Game is currently unavailable”

Restart steam. It works for me

In Steam: Right click on garrysmod -> Delete local content

Then close steam (stop the steam.exe process) and delete your garrysmod folder (C:\Program Files (x86)\Steam\SteamApps\steamusername\garrysmod)

Oh and use Avast antivirus. It’s free and more efficient.

Well usually when a VALVE game or mod’s HL2.exe is deleted, it’s supposed to reinstall it, it is not doing it