Well, I don't remember if it will delete all your games. Try make a backup of your "steamapps" folder. Just cut the folder and paste elsewhere. But be carefull! It's a CUT and paste operation ;D
Well, the game in my PC works normally, without any bugs (including yours), even with your save. Here the Hunter breaks the door, and the only way I can help you is by providing the save after the Hunter break it.
I just played it and saved at that part. I hope it may help you. The save (sorry...
Yes, enable the cheats. Bring up the console and enter "sv_cheats 1". Reload your game and then enter "noclip". Now you can walk through walls. Go inside the building and get the ammo. Then, go out and enter "noclip" to deactivate the cheat, and "sv_cheats 0" to deactivate the cheats at all...
I downloaded your save and played it. I just don't know which part exactly you're talking 'bout. Could you post some prints where the bug is happening? Thnx =)
Hahaha. I knew something was wrong xD Well, you definitely did not buy HL2: GOTY Edition. Are you sure you included in your purchase CS: Source? I believe that Valve is not delivering CS: Sources for free for those who purchase Half-Life 2 through Steam, or any other method other than a package...
Half-Life 2 GOTY Edition is still for sale? I thought not ... = / Anyway, if you bought HL2: GOTY Edition, CS: Source should be available in your account. If not, this was not the product you bought.
You bought a package that contains Half-Life 2 with CS: Source?? As far as I know, If you buy Half-Life 2, only will be released Half-Life 2 in your Steam account.
This error is common to all executable files in Windows, so it may be any possible problem.
Have you installed any copy of Windows again after last time you played and it was working?