I'm really glad you guys are helping me so much!...But i've already started a thread on STEAM forums and gotten technical support at support.steampowered.com.
They sent me a reply:
Hello,
Please follow the seven steps listed below to troubleshoot your issue. After each step, be sure to reboot your computer and try to run the game.
1. Update all graphics card/motherboard drivers, including your motherboard's BIOS. *NOTE* Be sure you are using the driver removal tool on your video card manufacturer's website to fully remove the old drivers before installing the new one, this step is necessary!**
If you are not sure how to update your drivers, please see these knowledge base articles:
Title: Updating Video Drivers
URL:
http://support.steampowered.com/cgi-bin/st...ated=1136400422
Title: Motherboard Information and Drivers
URL:
http://support.steampowered.com/cgi-bin/st...ated=1093739446
2. Download and install the most up to date version of DirectX. The latest version can be found on Microsoft's DirectX website:
http://www.microsoft.com/windows/directx/default.mspx
3. Download the latest drivers for your sound card. Please visit your soundcard manufacturer's website (ie:
http://www.creative.com) to find driver updates that may fix issues with Valve games. If you are using on-board sound through your motherboard, then drivers will be located on your motherboard manufacturer's website.
4. Run Windows Update, located in your Windows Start Menu under "All Programs". You can also run Windows Update by visiting:
http://update.microsoft.com/windowsupdate/...t.aspx?ln=en-us
5. If none of the above works, disable the soundcard via device manager and try running the game. Please see this Microsoft Windows article for more information about disabling a device:
http://support.microsoft.com/kb/310126/
6. Force Direct3d instead of OpenGL for the video mode, or visa versa. This setting can be changed in the game's "settings" or "options" menu, under "video."
7. Run a full spyware and virus scan of your system. Please see this knowledge base article for instructions and recommendations:
Title: Spyware, Adware, and Viruses Interfering with Steam
URL:
http://support.steampowered.com/cgi-bin/st...ated=1096098438
If none of the above works, please reply to this message and attach the error logs from the game you are attempting to play and an MSINFO32 report. If you are not sure how to create a MSINFO32 report, please see this article:
Title: MSINFO32 Reports
URL:
http://support.steampowered.com/cgi-bin/st...ated=1095979362
If you have any further questions, please let us know.
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I'm going to try and download a new driver for my video card and see if that helps anything...