Okay, so a while ago I lost my ext. HDD with TF2, GMod and some other stuff installed on it, along with steam. I reinstalled Steam (not the games, just steam) so I could chat with people.
Now I found it.
I played fine earlier, but now it's loving up.
When I try to open TF2, it asks me to install it. When I try to run the hl2.exe I get an error about gameinfo.txt or something like that.
what do