Portal 2 Crash

[Mr Crimes]

Hi ,
I've bought portal 2 recently and I downloaded+installed it on steam , but when I try to play it an error just comes up " portal2.exe has stopped working" .
Any idea what do I have to do ?
I've tried with anti-virus stopped , firewall down and it still doesnt work.
+ the same error shows up when trying to play Dota 2 !

If this helps : Problem details :

Problem signature:
Problem Event Name: APPCRASH
Application Name: portal2.exe
Application Version: 0.0.0.0
Application Timestamp: 4d4c804d
Fault Module Name: shaderapidx9.dll
Fault Module Version: 0.0.0.0
Fault Module Timestamp: 50987701
Exception Code: c0000005
Exception Offset: 00031de6
OS Version: 6.1.7600.2.0.0.256.1
Locale ID: 2057
Additional Information 1: 0a9e
Additional Information 2: 0a9e372d3b4ad19135b953a78882e789
Additional Information 3: 0a9e
Additional Information 4: 0a9e372d3b4ad19135b953a78882e789

Thanks.

[Muggins]

your pc specs?

[Mr Crimes]

Windows 7 , Ultimate x64
Processor : AMD FX(tm)-4100 Quad-Core 4.00 GHz
Ram : 8 GB
Graphics : AMD Radeon HD 6670

[Muggins]

ur pc is fine, try reinstalling it and dont touch the pc while its doing that, because sometimes the data gets corrupted during the download process, also check if ur internet speed is good or just restart ur router

[Warlord]

always when u have problems launching a steam game go to the games library and right click on the game and properties then Local Files tab and choose Verify integrity of game cache

[Dr. Ivo Robotnik]

Postat inițial de Warlord:

always when u have problems launching a steam game go to the games library and right click on the game and properties then Local Files tab and choose Verify integrity of game cache

google the prblem thats what i did and i have a worst cpu than you

[Mr Crimes]

Tried them ... still not working.

[Ample]

Try to delete you C.A.P files: Catalyst Application Profiles. (Because you have AMD) Delete this, and restart Portal 2. Search for it in Computer.