What to do? experts can come in

[hornetsjet]

hi all!!
i've installed hl2 and when i launched the game, that's no problem.
But why after afew minutes without touching anything, there's a window pop up said that the steam connection lost and some files is missing.afterthat my hl2 stop working.

what's the problem?

 

[Rhalle]

Your internet connection disconnected and re-connected.

and/or

Some of your files are corrupt.

Open Steam-- then News-- then Verify HL2 game files

Ads in the text of messages. God how awful....