Occasionally, I hear a robotic voice say “17” or “18” when I die. I uninstalled all subscriptions and manually deleted them. I also tried redownloading HL2, Gmod, HL1, and HLS. I only did the last two because I also heard this sound in Sven Coop. I did remove Sven Coop before redownloading HL1. If anybody could shed light on this subject, it would be handy.
Make sure you disable/uninstall the workshop subscription. (From Ingame first, followed by the garrysmod/garrysmod/addons directory)
I did this along with uninstalling all the source games, sorry, forgot to put that in, fixed now!