new gmod

just recently my hard drive had a major overload and had to be replaced so when i put the new hard drive in i know gmod and everything will be missing.if i go on the same pc will i be able to get gmod for free off of steam since i lost it or can i get it on my parents laptop(the one im using now) if i link it to my old steam account.

Yeah, your account has the game purchased, so you can get it anywhere else.