For ages my HL2 redownload has been stuck at 79%. It's been this way since I tried to reinstall it after several missing key files. Now, yesterday, when I updated Windows Media Player from v9 to v11, it seemed to kickstart it up again. But it only made it as far as 83% before my dad thought it was slowing the system down and made me shut it off. After discovering a process which WAS slowing it down, I turned it off, then turned Steam back on, only to find... the download's now stuck at 83%. I've tried everything suggested in the Valve troubleshooting page. Is there any way I can kickstart it again?
(Files that HL2 were missing included the first BSP of Route Kanal, the Eli model, and several obvious textures.)