Hi guys, I need your help :I
<a lot of text ahead!>
TLDR
I was recently playing Portal 2 on Singleplayer and when I was in some early test chamber (this one in which Wheatley says "Haha, you made it! There should be a portal surface over there" or sth like this) the game got sound lag (Wheatley - "you-you-you-you-you...."), game got black screen (Wheatley "made-made-made...") and then muted completely and the "portal2.exe has stopped working" error shown. I tried again and game crashed almost exactly in the same moment - in Announcer's voice line (it's few secs before Wheatley appears). It crashed again and I tried for the 3rd time. This time it crashed when Wheatley was talking that he shouldn't jump off the rail cause he will die etc.
Shorter version - It crashes in some early test chamber. I tried 3 times and it crashed during some of Wheatley's voice lines twice and during Announcer's lines once. So it doesn't crash everytime on the same thing I tried checking game files and there was 1 wrong file, but after redownloading it game still crashes. Any ideas?

My PC specs:
CPU - AMD Athlon 64 3000+
GPU - ATI Radeon HD 4670 512MB
RAM - 1.5 GB
Windows 7 32bit

(I know that this PC is veeery bad, but I have played Portal 2 for 80hrs and it never happened before.)

step 1:

step 2:
let us know if that worked or not

Ekhm....

kacperski1 wrote:
Hi guys, I need your help :I
(...)
I tried checking game files and there was 1 wrong file, but after redownloading it game still crashes.
(...)

I tried once again, and again 1 file with exactly the same size was broken :/
Game still crashes.

You may have to reinstall Portal 2.

I'm waiting for more useful information. I'm still a little confused. I should change it?