Yes, but they do not move or shoot.
Yes, but it is also single player, although you need to create your own server and add bots.
It has multiplayer and single player. Single doesn't have a campaign or story line, but you can play with bots (that don't move or shoot).
no
none specifically. Team Fortress 2 does NOT give you a virus.
Team Fortress 2 was initially a Quake Mod (Team Fortress), for Capture the Flag and Team Deathmatch
Team Fortress 2 is the sequel to the video game Team Fortress. There are similar characters and missions in both games, but the main differences are the new maps and new statistics capability in Team Fortress 2.
Team Fortress Classic and Team Fortress 2 is developed by Valve Inc.
Check your internet connection and if something is blocking your TF2 from running online. Alternatively, you can play offline with bots.
No, there are no throwable grenades in Team Fortress 2
Team Fortress does not have levels.
You can find Team Fortress 2 at store.steampowered.com
Team Fortress 2 is Free on Steam